diff --git a/audio/int16_16_t.cpp b/audio/int16_16_t.cpp
index 380f1e9..e602596 100644
--- a/audio/int16_16_t.cpp
+++ b/audio/int16_16_t.cpp
@@ -4,10 +4,8 @@
  * @license APACHE v2.0 (see license file)
  */
 
-#include <audio/debug.h>
 #include <audio/int16_16_t.h>
-
-
+#include <audio/debug.h>
 
 audio::int16_16_t::int16_16_t(const audio::int8_8_t& _val) {
 	m_data = int16_t(_val.get()) << 8;
@@ -86,7 +84,7 @@ void audio::int16_16_t::set(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int16_16_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":0.16=";
+	_os << "[" << etk::to_string(_obj.get()) << ":0.15=";
 	_os << etk::to_string(double(_obj.get())/double(INT16_MAX));
 	_os << "]";
 	return _os;
diff --git a/audio/int16_16_t.h b/audio/int16_16_t.h
index 633261a..79211d9 100644
--- a/audio/int16_16_t.h
+++ b/audio/int16_16_t.h
@@ -12,6 +12,13 @@
 #include <audio/debug.h>
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |BS|                  < 1.0                     |
+	 * +--+--------------------------------------------+
+	 */
 	class int16_16_t{
 		private:
 			int16_t m_data;
diff --git a/audio/int16_32_t.cpp b/audio/int16_32_t.cpp
index f9e6eda..1450311 100644
--- a/audio/int16_32_t.cpp
+++ b/audio/int16_32_t.cpp
@@ -52,7 +52,7 @@ audio::int16_32_t::int16_32_t(const audio::float_t& _val) {
 	m_data = int32_t(std::avg(float(INT16_MIN),
 	                          _val.get(),
 	                          float(INT16_MAX)
-	                          ) * float(INT16_MAX)
+	                          ) * float(INT16_MAX) * 2.0f
 	                 );
 }
 
@@ -60,7 +60,7 @@ audio::int16_32_t::int16_32_t(const audio::double_t& _val) {
 	m_data = int32_t(std::avg(double(INT16_MIN),
 	                          _val.get(),
 	                          double(INT16_MAX)
-	                          ) * double(INT16_MAX)
+	                          ) * double(INT16_MAX) * 2.0
 	                 );
 }
 
@@ -69,13 +69,13 @@ audio::int16_32_t::int16_32_t(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 void audio::int16_32_t::set(int64_t _value, int32_t _flotingPointPosition) {
-	int64_t val = _value << (15-_flotingPointPosition);
+	int64_t val = _value << (16-_flotingPointPosition);
 	m_data = std::avg(int64_t(INT32_MIN), val, int64_t(INT32_MAX));
 }
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int16_32_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":8.16=";
-	_os << etk::to_string(double(_obj.get())/double(INT16_MAX));
+	_os << "[" << etk::to_string(_obj.get()) << ":7.16=";
+	_os << etk::to_string(double(_obj.get())/double(INT16_MAX)*0.5);
 	_os << "]";
 	return _os;
 }
diff --git a/audio/int16_32_t.h b/audio/int16_32_t.h
index e505331..b756321 100644
--- a/audio/int16_32_t.h
+++ b/audio/int16_32_t.h
@@ -10,6 +10,13 @@
 #define __AUDIO_TYPE_INT16_32_T_H__
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |BS|                  > 1.0                     |                    < 1.0                      |
+	 * +--+--------------------------------------------+-----------------------------------------------+
+	 */
 	class int16_32_t{
 		private:
 			int32_t m_data;
@@ -116,8 +123,8 @@ namespace audio {
 			 *    *= operator
 			 *****************************************************/
 			const int16_32_t& operator*= (const int16_32_t& _obj) {
-				int64_t tmp = int64_t(m_data) * int64_t(_obj.m_data) + (1<<14);
-				m_data = int32_t(tmp >> 15);
+				int64_t tmp = int64_t(m_data) * int64_t(_obj.m_data) + (1<<15);
+				m_data = int32_t(tmp >> 16);
 				return *this;
 			}
 			/* ****************************************************
@@ -132,7 +139,7 @@ namespace audio {
 			 *    /= operator
 			 *****************************************************/
 			const int16_32_t& operator/= (const int16_32_t& _obj) {
-				int64_t tmp = (int64_t(m_data) << 15) / int64_t(_obj.m_data);
+				int64_t tmp = (int64_t(m_data) << 16) / int64_t(_obj.m_data);
 				m_data = int32_t(tmp);
 				return *this;
 			}
diff --git a/audio/int24_24_t.cpp b/audio/int24_24_t.cpp
index 5e505bd..5fddbe7 100644
--- a/audio/int24_24_t.cpp
+++ b/audio/int24_24_t.cpp
@@ -69,7 +69,7 @@ audio::int24_24_t::int24_24_t(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 void audio::int24_24_t::set(int64_t _value, int32_t _flotingPointPosition) {
-	int64_t val = _value << (24-_flotingPointPosition);
+	int64_t val = _value << (23-_flotingPointPosition);
 	val = std::avg(int64_t(INT24_MIN), val, int64_t(INT24_MAX));
 	m_data[0] = (val & 0x000000ff);
 	m_data[1] = (val & 0x0000ff00) >> 8;
@@ -91,7 +91,7 @@ int32_t audio::int24_24_t::get() const {
 }
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int24_24_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":0.24=";
+	_os << "[" << etk::to_string(_obj.get()) << ":0.23=";
 	_os << etk::to_string(double(_obj.get())/double(INT24_MAX));
 	_os << "]";
 	return _os;
diff --git a/audio/int24_24_t.h b/audio/int24_24_t.h
index a516864..06f676f 100644
--- a/audio/int24_24_t.h
+++ b/audio/int24_24_t.h
@@ -10,6 +10,13 @@
 #define __AUDIO_TYPE_INT24_24_T_H__
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |BS|                                  < 1.0                             |
+	 * +--+--------------------------------------------------------------------+
+	 */
 	class int24_24_t {
 		private:
 			uint8_t m_data[3];
diff --git a/audio/int24_32_t.cpp b/audio/int24_32_t.cpp
index ab8c71b..91b7bd3 100644
--- a/audio/int24_32_t.cpp
+++ b/audio/int24_32_t.cpp
@@ -77,7 +77,7 @@ audio::int24_32_t::int24_32_t(const audio::float_t& _val) {
 	m_data = int32_t(std::avg(float(INT8_MIN),
 	                          _val.get(),
 	                          float(INT8_MAX)
-	                          ) * float(INT24_MAX)
+	                          ) * float(INT24_MAX) * 2.0f
 	                 );
 }
 
@@ -85,7 +85,7 @@ audio::int24_32_t::int24_32_t(const audio::double_t& _val) {
 	m_data = int32_t(std::avg(-1.0,
 	                          _val.get(),
 	                          1.0
-	                          ) * double(INT24_MAX)
+	                          ) * double(INT24_MAX) * 2.0
 	                 );
 }
 
@@ -100,8 +100,8 @@ void audio::int24_32_t::set(int64_t _value, int32_t _flotingPointPosition) {
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int24_32_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << "8:24=";
-	_os << etk::to_string(double(_obj.get())/double(INT24_MAX));
+	_os << "[" << etk::to_string(_obj.get()) << "7:24=";
+	_os << etk::to_string(double(_obj.get())/double(INT24_MAX)*0.5);
 	_os << "]";
 	return _os;
 }
diff --git a/audio/int24_32_t.h b/audio/int24_32_t.h
index 5b99528..f2c15a3 100644
--- a/audio/int24_32_t.h
+++ b/audio/int24_32_t.h
@@ -10,6 +10,13 @@
 #define __AUDIO_TYPE_INT24_32_T_H__
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |BS|      > 1.0         |                               < 1.0                                   |
+	 * +--+--------------------+-----------------------------------------------------------------------+
+	 */
 	class int24_32_t {
 		private:
 			int32_t m_data;
@@ -117,7 +124,7 @@ namespace audio {
 			 *****************************************************/
 			const int24_32_t& operator*= (const int24_32_t& _obj) {
 				int64_t tmp = int64_t(m_data) * int64_t(_obj.m_data);
-				m_data = int32_t(tmp >> 8);
+				m_data = int32_t(tmp >> 24);
 				return *this;
 			}
 			/* ****************************************************
diff --git a/audio/int32_32_t.cpp b/audio/int32_32_t.cpp
index d699223..bbffbb8 100644
--- a/audio/int32_32_t.cpp
+++ b/audio/int32_32_t.cpp
@@ -90,7 +90,7 @@ audio::int32_32_t::int32_32_t(const audio::float_t& _val) {
 }
 
 audio::int32_32_t::int32_32_t(const audio::double_t& _val) {
-	m_data = int16_t(std::avg(-1.0,
+	m_data = int32_t(std::avg(-1.0,
 	                          _val.get(),
 	                          1.0
 	                          ) * double(INT32_MAX)
@@ -102,13 +102,13 @@ audio::int32_32_t::int32_32_t(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 void audio::int32_32_t::set(int64_t _value, int32_t _flotingPointPosition) {
-	int64_t val = _value << (32-_flotingPointPosition);
+	int64_t val = _value << (31-_flotingPointPosition);
 	m_data = std::avg(int64_t(INT32_MIN), val, int64_t(INT32_MAX));
 }
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int32_32_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":0.32=";
+	_os << "[" << etk::to_string(_obj.get()) << ":0.31=";
 	_os << etk::to_string(double(_obj.get())/double(INT16_MAX));
 	_os << "]";
 	return _os;
diff --git a/audio/int32_32_t.h b/audio/int32_32_t.h
index 3754553..53a074b 100644
--- a/audio/int32_32_t.h
+++ b/audio/int32_32_t.h
@@ -12,6 +12,11 @@
 #include <audio/debug.h>
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 */
 	class int32_32_t {
 		private:
 			int32_t m_data;
@@ -118,8 +123,8 @@ namespace audio {
 			 *    *= operator
 			 *****************************************************/
 			const int32_32_t& operator*= (const int32_32_t& _obj) {
-				int64_t tmp = int32_t(m_data) * int32_t(_obj.m_data);
-				m_data = int32_t(tmp >> 32);
+				int64_t tmp = int64_t(m_data) * int64_t(_obj.m_data) + (1LL<<30);
+				m_data = int32_t(tmp >> 31);
 				return *this;
 			}
 			/* ****************************************************
@@ -134,7 +139,7 @@ namespace audio {
 			 *    /= operator
 			 *****************************************************/
 			const int32_32_t& operator/= (const int32_32_t& _obj) {
-				int64_t tmp = (int64_t(m_data) << 32) / int32_t(_obj.m_data);
+				int64_t tmp = (int64_t(m_data) << 31) / int64_t(_obj.m_data);
 				m_data = int32_t(tmp);
 				return *this;
 			}
diff --git a/audio/int32_64_t.cpp b/audio/int32_64_t.cpp
index 891386e..be305cf 100644
--- a/audio/int32_64_t.cpp
+++ b/audio/int32_64_t.cpp
@@ -69,7 +69,7 @@ audio::int32_64_t::int32_64_t(const audio::float_t& _val) {
 	m_data = int64_t(std::avg(float(INT32_MIN),
 	                          _val.get(),
 	                          float(INT32_MAX)
-	                          ) * float(INT32_MAX)
+	                          ) * float(INT32_MAX) * 2.0f
 	                 );
 }
 
@@ -77,7 +77,7 @@ audio::int32_64_t::int32_64_t(const audio::double_t& _val) {
 	m_data = int64_t(std::avg(double(INT32_MIN),
 	                          _val.get(),
 	                          double(INT32_MIN)
-	                          ) * double(INT32_MAX)
+	                          ) * double(INT32_MAX) * 2.0
 	                 );
 }
 
@@ -92,8 +92,8 @@ void audio::int32_64_t::set(int64_t _value, int32_t _flotingPointPosition) {
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int32_64_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":32.32=";
-	_os << etk::to_string(double(_obj.get())/double(INT32_MAX));
+	_os << "[" << etk::to_string(_obj.get()) << ":31.32=";
+	_os << etk::to_string(double(_obj.get())/double(INT32_MAX)*0.5);
 	_os << "]";
 	return _os;
 }
diff --git a/audio/int32_64_t.h b/audio/int32_64_t.h
index fce9b17..181e27f 100644
--- a/audio/int32_64_t.h
+++ b/audio/int32_64_t.h
@@ -116,8 +116,8 @@ namespace audio {
 			 *    *= operator
 			 *****************************************************/
 			const int32_64_t& operator*= (const int32_64_t& _obj) {
-				int64_t tmp = m_data>>12 * _obj.m_data>>12;
-				m_data = int64_t(tmp >> 8);
+				int64_t tmp = m_data * _obj.m_data;
+				m_data = int64_t(tmp >> 32);
 				return *this;
 			}
 			/* ****************************************************
@@ -132,7 +132,7 @@ namespace audio {
 			 *    /= operator
 			 *****************************************************/
 			const int32_64_t& operator/= (const int32_64_t& _obj) {
-				int64_t tmp = (int64_t(m_data) << 16) / int16_t(_obj.m_data);
+				int64_t tmp = (int64_t(m_data) << 16) / int64_t(_obj.m_data) + (1LL<<15);
 				m_data = int64_t(tmp)<<16;
 				return *this;
 			}
diff --git a/audio/int64_64_t.cpp b/audio/int64_64_t.cpp
index e170968..c11804e 100644
--- a/audio/int64_64_t.cpp
+++ b/audio/int64_64_t.cpp
@@ -98,13 +98,13 @@ audio::int64_64_t::int64_64_t(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 void audio::int64_64_t::set(int64_t _value, int32_t _flotingPointPosition) {
-	int64_t val = _value << (64-_flotingPointPosition);
+	int64_t val = _value << (63-_flotingPointPosition);
 	m_data = std::avg(int64_t(INT64_MIN), val, int64_t(INT64_MAX));
 }
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int64_64_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":0.64=";
+	_os << "[" << etk::to_string(_obj.get()) << ":0.63=";
 	_os << etk::to_string(double(_obj.get())/double(INT64_MAX));
 	_os << "]";
 	return _os;
diff --git a/audio/int64_64_t.h b/audio/int64_64_t.h
index bdff92a..ccd4652 100644
--- a/audio/int64_64_t.h
+++ b/audio/int64_64_t.h
@@ -118,7 +118,7 @@ namespace audio {
 			 *    *= operator
 			 *****************************************************/
 			const int64_64_t& operator*= (const int64_64_t& _obj) {
-				int16_t tmp = (m_data >> 32) * (_obj.m_data >> 32);
+				int16_t tmp = (m_data >> 31) * (_obj.m_data >> 32);
 				m_data = tmp;
 				return *this;
 			}
@@ -134,7 +134,7 @@ namespace audio {
 			 *    /= operator
 			 *****************************************************/
 			const int64_64_t& operator/= (const int64_64_t& _obj) {
-				int64_t tmp = (m_data << 32) / (_obj.m_data>>32);
+				int64_t tmp = (m_data << 31) / (_obj.m_data>>32);
 				m_data = tmp;
 				return *this;
 			}
diff --git a/audio/int8_16_t.cpp b/audio/int8_16_t.cpp
index b915d12..d0b9a66 100644
--- a/audio/int8_16_t.cpp
+++ b/audio/int8_16_t.cpp
@@ -77,7 +77,7 @@ audio::int8_16_t::int8_16_t(const audio::float_t& _val) {
 	m_data = int16_t(std::avg(float(INT8_MIN),
 	                          _val.get(),
 	                          float(INT8_MAX)
-	                          ) * float(INT8_MAX)
+	                          ) * float(INT8_MAX) * 2.0f
 	                 );
 }
 
@@ -85,7 +85,7 @@ audio::int8_16_t::int8_16_t(const audio::double_t& _val) {
 	m_data = int16_t(std::avg(double(INT8_MIN),
 	                          _val.get(),
 	                          double(INT8_MAX)
-	                          ) * double(INT8_MAX)
+	                          ) * double(INT8_MAX) * 2.0
 	                 );
 }
 
@@ -100,8 +100,8 @@ void audio::int8_16_t::set(int64_t _value, int32_t _flotingPointPosition) {
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int8_16_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":8.8=";
-	_os << etk::to_string(double(_obj.get())/double(INT8_MAX));
+	_os << "[" << etk::to_string(_obj.get()) << ":7.8=";
+	_os << etk::to_string(double(_obj.get())/double(INT8_MAX)*0.5);
 	_os << "]";
 	return _os;
 }
diff --git a/audio/int8_16_t.h b/audio/int8_16_t.h
index f00ee58..296ab11 100644
--- a/audio/int8_16_t.h
+++ b/audio/int8_16_t.h
@@ -10,6 +10,13 @@
 #define __AUDIO_TYPE_INT8_16_T_H__
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |BS|        > 1.0       |      < 1.0            |
+	 * +--+--------------------------------------------+
+	 */
 	class int8_16_t {
 		private:
 			int16_t m_data;
diff --git a/audio/int8_8_t.cpp b/audio/int8_8_t.cpp
index 4d99d9a..1902055 100644
--- a/audio/int8_8_t.cpp
+++ b/audio/int8_8_t.cpp
@@ -100,13 +100,13 @@ audio::int8_8_t::int8_8_t(int64_t _value, int32_t _flotingPointPosition) {
 }
 
 void audio::int8_8_t::set(int64_t _value, int32_t _flotingPointPosition) {
-	int64_t val = _value << (8-_flotingPointPosition);
+	int64_t val = _value << (7-_flotingPointPosition);
 	m_data = std::avg(int64_t(INT8_MIN), val, int64_t(INT8_MAX));
 }
 
 
 std::ostream& audio::operator <<(std::ostream& _os, const audio::int8_8_t& _obj) {
-	_os << "[" << etk::to_string(_obj.get()) << ":0.8=";
+	_os << "[" << etk::to_string(_obj.get()) << ":0.7=";
 	_os << etk::to_string(double(_obj.get())/double(INT8_MAX));
 	_os << "]";
 	return _os;
diff --git a/audio/int8_8_t.h b/audio/int8_8_t.h
index 538bf88..af96cc2 100644
--- a/audio/int8_8_t.h
+++ b/audio/int8_8_t.h
@@ -12,6 +12,11 @@
 #include <audio/debug.h>
 
 namespace audio {
+	/**
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 * |31|30|29|28|27|26|25|24|23|22|21|20|19|18|17|16|15|14|13|12|11|10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0|
+	 * +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
+	 */
 	class int8_8_t {
 		private:
 			int8_t m_data;
@@ -119,7 +124,7 @@ namespace audio {
 			 *****************************************************/
 			const int8_8_t& operator*= (const int8_8_t& _obj) {
 				int16_t tmp = int16_t(m_data) * int16_t(_obj.m_data);
-				m_data = int8_t(tmp >> 8);
+				m_data = int8_t(tmp >> 7);
 				return *this;
 			}
 			/* ****************************************************
@@ -134,7 +139,7 @@ namespace audio {
 			 *    /= operator
 			 *****************************************************/
 			const int8_8_t& operator/= (const int8_8_t& _obj) {
-				int16_t tmp = (int16_t(m_data) << 8) / int16_t(_obj.m_data);
+				int16_t tmp = (int16_t(m_data) << 7) / int16_t(_obj.m_data);
 				m_data = int8_t(tmp);
 				return *this;
 			}
diff --git a/lutin_audio_test.py b/lutin_audio_test.py
index 1c85a39..ffec882 100644
--- a/lutin_audio_test.py
+++ b/lutin_audio_test.py
@@ -13,8 +13,13 @@ def create(target):
 		'test/debug.cpp',
 		'test/main.cpp',
 		'test/base.cpp',
+		'test/test_int8_8.cpp',
+		'test/test_int8_16.cpp',
 		'test/test_int16_16.cpp',
 		'test/test_int16_32.cpp',
+		'test/test_int32_32.cpp',
+		'test/test_int32_64.cpp',
+		'test/test_int64_64.cpp',
 		'test/test_float.cpp'
 		])
 	myModule.add_module_depend(['audio', 'gtest'])
diff --git a/test/base.cpp b/test/base.cpp
index 978aa5b..cb3cdef 100644
--- a/test/base.cpp
+++ b/test/base.cpp
@@ -11,15 +11,15 @@
 
 
 TEST(TestBase, type_int8_8_t) {
-	audio::int8_8_t typeBase(16, 8);
+	audio::int8_8_t typeBase(16, 7);
 	EXPECT_EQ(typeBase.get(), 16);
-	typeBase.set(INT8_MIN, 8);
+	typeBase.set(INT8_MIN, 7);
 	EXPECT_EQ(typeBase.get(), INT8_MIN);
-	typeBase.set(INT8_MAX, 8);
+	typeBase.set(INT8_MAX, 7);
 	EXPECT_EQ(typeBase.get(), INT8_MAX);
-	typeBase.set(INT8_MAX+200, 8);
+	typeBase.set(INT8_MAX+200, 7);
 	EXPECT_EQ(typeBase.get(), INT8_MAX);
-	typeBase.set(INT8_MIN-200, 8);
+	typeBase.set(INT8_MIN-200, 7);
 	EXPECT_EQ(typeBase.get(), INT8_MIN);
 	typeBase.set(-125);
 	EXPECT_EQ(typeBase.get(), -125);
@@ -42,15 +42,15 @@ TEST(TestBase, type_int8_16_t) {
 
 
 TEST(TestBase, type_int16_16_t) {
-	audio::int16_16_t typeBase(16, 16);
+	audio::int16_16_t typeBase(16, 15);
 	EXPECT_EQ(typeBase.get(), 16);
-	typeBase.set(INT16_MIN, 16);
+	typeBase.set(INT16_MIN, 15);
 	EXPECT_EQ(typeBase.get(), INT16_MIN);
-	typeBase.set(INT16_MAX, 16);
+	typeBase.set(INT16_MAX, 15);
 	EXPECT_EQ(typeBase.get(), INT16_MAX);
-	typeBase.set(INT16_MAX+200, 16);
+	typeBase.set(INT16_MAX+200, 15);
 	EXPECT_EQ(typeBase.get(), INT16_MAX);
-	typeBase.set(INT16_MIN-200, 16);
+	typeBase.set(INT16_MIN-200, 15);
 	EXPECT_EQ(typeBase.get(), INT16_MIN);
 	typeBase.set(-250);
 	EXPECT_EQ(typeBase.get(), -250);
@@ -73,15 +73,15 @@ TEST(TestBase, type_int16_32_t) {
 
 
 TEST(TestBase, type_int24_24_t) {
-	audio::int24_24_t typeBase(16, 24);
+	audio::int24_24_t typeBase(16, 23);
 	EXPECT_EQ(typeBase.get(), 16);
-	typeBase.set(INT24_MIN, 24);
+	typeBase.set(INT24_MIN, 23);
 	EXPECT_EQ(typeBase.get(), INT24_MIN);
-	typeBase.set(INT24_MAX, 24);
+	typeBase.set(INT24_MAX, 23);
 	EXPECT_EQ(typeBase.get(), INT24_MAX);
-	typeBase.set(int64_t(INT24_MAX)+200, 24);
+	typeBase.set(int64_t(INT24_MAX)+200, 23);
 	EXPECT_EQ(typeBase.get(), INT24_MAX);
-	typeBase.set(int64_t(INT24_MIN)-200, 24);
+	typeBase.set(int64_t(INT24_MIN)-200, 23);
 	EXPECT_EQ(typeBase.get(), INT24_MIN);
 	typeBase.set(-250);
 	EXPECT_EQ(typeBase.get(), -250);
@@ -104,15 +104,15 @@ TEST(TestBase, type_int24_32_t) {
 }
 
 TEST(TestBase, type_int32_32_t) {
-	audio::int32_32_t typeBase(16, 32);
+	audio::int32_32_t typeBase(16, 31);
 	EXPECT_EQ(typeBase.get(), 16);
-	typeBase.set(INT32_MIN, 32);
+	typeBase.set(INT32_MIN, 31);
 	EXPECT_EQ(typeBase.get(), INT32_MIN);
-	typeBase.set(INT32_MAX, 32);
+	typeBase.set(INT32_MAX, 31);
 	EXPECT_EQ(typeBase.get(), INT32_MAX);
-	typeBase.set(int64_t(INT32_MAX)+200, 32);
+	typeBase.set(int64_t(INT32_MAX)+200, 31);
 	EXPECT_EQ(typeBase.get(), INT32_MAX);
-	typeBase.set(int64_t(INT32_MIN)-200, 32);
+	typeBase.set(int64_t(INT32_MIN)-200, 31);
 	EXPECT_EQ(typeBase.get(), INT32_MIN);
 	typeBase.set(-250);
 	EXPECT_EQ(typeBase.get(), -250);
@@ -130,11 +130,11 @@ TEST(TestBase, type_int32_64_t) {
 }
 
 TEST(TestBase, type_int64_64_t) {
-	audio::int64_64_t typeBase(16, 64);
+	audio::int64_64_t typeBase(16, 63);
 	EXPECT_EQ(typeBase.get(), 16);
-	typeBase.set(INT64_MIN, 64);
+	typeBase.set(INT64_MIN, 63);
 	EXPECT_EQ(typeBase.get(), INT64_MIN);
-	typeBase.set(INT64_MAX, 64);
+	typeBase.set(INT64_MAX, 63);
 	EXPECT_EQ(typeBase.get(), INT64_MAX);
 	typeBase.set(-250);
 	EXPECT_EQ(typeBase.get(), -250);
diff --git a/test/test_double.cpp b/test/test_double.cpp
new file mode 100644
index 0000000..e69de29
diff --git a/test/test_int16_16.cpp b/test/test_int16_16.cpp
index ba7cc58..0acd00b 100644
--- a/test/test_int16_16.cpp
+++ b/test/test_int16_16.cpp
@@ -22,11 +22,8 @@ TEST(TestInt16_16, basicOperator) {
 	out *= typeBase;
 	EXPECT_EQ(out.get(), 0);
 	out = audio::float_t(0.3);
-	APPL_INFO(" data = " << out);
 	out += audio::float_t(0.3);
-	APPL_INFO(" data = " << out);
 	EXPECT_EQ(out.get(), audio::int16_16_t(audio::float_t(0.6)).get());
 	out *= audio::float_t(0.3);
-	APPL_INFO(" data = " << out);
 	EXPECT_EQ(out.get(), audio::int16_16_t(audio::float_t(0.18)).get());
 }
diff --git a/test/test_int16_32.cpp b/test/test_int16_32.cpp
index 764628a..711817a 100644
--- a/test/test_int16_32.cpp
+++ b/test/test_int16_32.cpp
@@ -15,7 +15,7 @@ TEST(TestInt16_32, basicOperator) {
 	audio::int16_32_t out(1, 0);
 	
 	APPL_INFO(" data = " << out);
-	EXPECT_EQ(out.get(), ((1<<15)));
+	EXPECT_EQ(out.get(), ((1<<16)));
 	out *= 16;
 	APPL_INFO(" data = " << out);
 	EXPECT_EQ(out.get(), 16);
diff --git a/test/test_int24_32.cpp b/test/test_int24_32.cpp
new file mode 100644
index 0000000..ac420e5
--- /dev/null
+++ b/test/test_int24_32.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt24_32, basicOperator) {
+	audio::int24_32_t typeBase(16);
+	audio::int24_32_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), ((1<<16)));
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int24_32_t(audio::float_t(0.6)).get());
+	out *= audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int24_32_t(audio::float_t(0.18)).get());
+}
+
+
diff --git a/test/test_int32_32.cpp b/test/test_int32_32.cpp
new file mode 100644
index 0000000..05b805f
--- /dev/null
+++ b/test/test_int32_32.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt32_32, basicOperator) {
+	audio::int32_32_t typeBase(16);
+	audio::int32_32_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), INT32_MAX);
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int32_32_t(audio::double_t(0.6)).get());
+	out *= audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int32_32_t(audio::double_t(0.18)).get());
+}
+
+
diff --git a/test/test_int32_64.cpp b/test/test_int32_64.cpp
new file mode 100644
index 0000000..6edfbe6
--- /dev/null
+++ b/test/test_int32_64.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt32_64, basicOperator) {
+	audio::int32_64_t typeBase(16);
+	audio::int32_64_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), (int64_t(INT32_MAX)+1)*2);
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int32_64_t(audio::double_t(0.6)).get());
+	out *= audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int32_64_t(audio::double_t(0.18)).get());
+}
+
+
diff --git a/test/test_int64_64.cpp b/test/test_int64_64.cpp
new file mode 100644
index 0000000..f368545
--- /dev/null
+++ b/test/test_int64_64.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt64_64, basicOperator) {
+	audio::int64_64_t typeBase(16);
+	audio::int64_64_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), INT64_MAX);
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int64_64_t(audio::double_t(0.6)).get());
+	out *= audio::double_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int64_64_t(audio::double_t(0.18)).get());
+}
+
+
diff --git a/test/test_int8_16.cpp b/test/test_int8_16.cpp
new file mode 100644
index 0000000..f706e27
--- /dev/null
+++ b/test/test_int8_16.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt8_16, basicOperator) {
+	audio::int8_16_t typeBase(16);
+	audio::int8_16_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), ((1<<16)));
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int8_16_t(audio::float_t(0.6)).get());
+	out *= audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int8_16_t(audio::float_t(0.18)).get());
+}
+
+
diff --git a/test/test_int8_8.cpp b/test/test_int8_8.cpp
new file mode 100644
index 0000000..6a4a7bf
--- /dev/null
+++ b/test/test_int8_8.cpp
@@ -0,0 +1,38 @@
+/** @file
+ * @author Edouard DUPIN 
+ * @copyright 2015, Edouard DUPIN, all right reserved
+ * @license APACHE v2.0 (see license file)
+ */
+
+#include "debug.h"
+#include <gtest/gtest.h>
+#include <audio/types.h>
+
+
+
+TEST(TestInt8_8, basicOperator) {
+	audio::int8_8_t typeBase(16);
+	audio::int8_8_t out(1, 0);
+	
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), ((1<<16)));
+	out *= 16;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 16);
+	out = 1;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 1);
+	out *= typeBase;
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), 0);
+	out = audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	out += audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int8_8_t(audio::float_t(0.6)).get());
+	out *= audio::float_t(0.3);
+	APPL_INFO(" data = " << out);
+	EXPECT_EQ(out.get(), audio::int8_8_t(audio::float_t(0.18)).get());
+}
+
+