diff --git a/airtaudio/Interface.cpp b/airtaudio/Interface.cpp
index 6a45378..cd26175 100644
--- a/airtaudio/Interface.cpp
+++ b/airtaudio/Interface.cpp
@@ -30,16 +30,16 @@ void airtaudio::Interface::openRtApi(airtaudio::api::type _api) {
 	delete m_rtapi;
 	m_rtapi = nullptr;
 	for (auto &it :m_apiAvaillable) {
-		ATA_ERROR("try open " << it.first);
+		ATA_INFO("try open " << it.first);
 		if (_api == it.first) {
-			ATA_ERROR("    ==> call it");
+			ATA_INFO("    ==> call it");
 			m_rtapi = it.second();
 			if (m_rtapi != nullptr) {
 				return;
 			}
 		}
 	}
-	// TODO : An eror occured ...
+	// TODO : An error occured ...
 	ATA_ERROR("Error in open API ...");
 }
 
@@ -100,10 +100,13 @@ enum airtaudio::errorType airtaudio::Interface::instanciate(airtaudio::api::type
 		return airtaudio::errorNone;
 	}
 	if (_api != airtaudio::api::UNSPECIFIED) {
-		ATA_ERROR("API specified ...");
+		ATA_INFO("API specified : " << _api);
 		// Attempt to open the specified API.
 		openRtApi(_api);
 		if (m_rtapi != nullptr) {
+			if (m_rtapi->getDeviceCount() != 0) {
+				ATA_INFO("    ==> api open");
+			}
 			return airtaudio::errorNone;
 		}
 		// No compiled support for specified API value.	Issue a debug
diff --git a/airtaudio/Interface.h b/airtaudio/Interface.h
index 3242823..991cf41 100644
--- a/airtaudio/Interface.h
+++ b/airtaudio/Interface.h
@@ -291,7 +291,7 @@ namespace airtaudio {
 			}
 			/**
 			 * @brief On some systems, the sample rate used may be slightly different
-			 * than that specified in the stream parameters.	If a stream is not
+			 * than that specified in the stream parameters. If a stream is not
 			 * open, an RtError (type = INVALID_USE) will be thrown.
 			 * @return Returns actual sample rate in use by the stream.
 			 */
diff --git a/airtaudio/base.h b/airtaudio/base.h
index 228c799..fd8c4d0 100644
--- a/airtaudio/base.h
+++ b/airtaudio/base.h
@@ -66,11 +66,6 @@ namespace airtaudio {
 	static const format FLOAT32 = 0x10; // Normalized between plus/minus 1.0.
 	static const format FLOAT64 = 0x20; // Normalized between plus/minus 1.0.
 	
-	/**
-	 * @brief Debug operator To display the curent element in a Human redeable information
-	 */
-	//std::ostream& operator <<(std::ostream& _os, const airtaudio::format& _obj);
-	
 	/**
 	 * @typedef typedef uint64_t streamFlags;
 	 * @brief RtAudio stream option flags.
@@ -142,11 +137,6 @@ namespace airtaudio {
 	static const streamStatus INPUT_OVERFLOW = 0x1; // Input data was discarded because of an overflow condition at the driver.
 	static const streamStatus OUTPUT_UNDERFLOW = 0x2; // The output buffer ran low, likely causing a gap in the output sound.
 	
-	/**
-	 * @brief Debug operator To display the curent element in a Human redeable information
-	 */
-	//std::ostream& operator <<(std::ostream& _os, const airtaudio::streamStatus& _obj);
-	
 	/**
 	 * @brief RtAudio callback function prototype.
 	 *