Fixes around audio "on remote computer"

* Better options to debug
* Fixes as of n2, https://dev.vatsim-germany.org/boards/22/topics/1792?r=1802#message-1802
* Doxygen

src/blacksound/soundgenerator.cpp

@@ -391,7 +391,6 @@ namespace BlackSound
             }
         }
         return qtDevice;
-
     }
 
     CSoundGenerator *CSoundGenerator::playSignal(qint32 volume, const QList<CSoundGenerator::Tone> &tones, QAudioDeviceInfo device)
@@ -500,4 +499,22 @@ namespace BlackSound
         // I cannot delete the file here, only after it has been played
         if (removeFileAfterPlaying) BlackMisc::CFileDeleter::addFileForDeletion(file);
     }
+
+    void CSoundGenerator::printAllQtSoundDevices()
+    {
+        qDebug() << "output";
+        foreach(QAudioDeviceInfo qd, QAudioDeviceInfo::availableDevices(QAudio::AudioOutput))
+        {
+            qDebug() << qd.deviceName();
+        }
+
+        qDebug() << "input";
+        foreach(QAudioDeviceInfo qd, QAudioDeviceInfo::availableDevices(QAudio::AudioInput))
+        {
+            qDebug() << qd.deviceName();
+        }
+
+
+    }
+
 } // namespace

src/blacksound/soundgenerator.h

@@ -190,6 +190,9 @@ namespace BlackSound
          */
         static void playNotificationSound(qint32 volume, CNotificationSounds::Notification notification);
 
+        //! For debugging purposes
+        void static printAllQtSoundDevices();
+
     signals:
         /*!
          * \brief Device was closed