Clarify default constructurs without AudioSettings

input_i2s_f32.h

@@ -36,6 +36,7 @@ class AudioInputI2S_F32 : public AudioStream_F32
 {
 //GUI: inputs:0, outputs:2  //this line used for automatic generation of GUI nodes
 public:
+	AudioInputI2S_F32(void) : AudioStream_F32(0, NULL) { begin(); } //uses default AUDIO_SAMPLE_RATE and BLOCK_SIZE_SAMPLES from AudioStream.h
 	AudioInputI2S_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL) { 
 		sample_rate_Hz = settings.sample_rate_Hz;
 		audio_block_samples = settings.audio_block_samples;

output_i2s_f32.h

@@ -37,6 +37,7 @@ class AudioOutputI2S_F32 : public AudioStream_F32
 {
 //GUI: inputs:2, outputs:0  //this line used for automatic generation of GUI node
 public:
+	AudioOutputI2S_F32(void) : AudioStream_F32(2, inputQueueArray)	{ begin();} //uses default AUDIO_SAMPLE_RATE and BLOCK_SIZE_SAMPLES from AudioStream.h
 	AudioOutputI2S_F32(const AudioSettings_F32 &settings) : AudioStream_F32(2, inputQueueArray)
 	{ 
 		sample_rate_Hz = settings.sample_rate_Hz;

synth_sine_f32.h

@@ -23,7 +23,7 @@ class AudioSynthWaveformSine_F32 : public AudioStream_F32
 //GUI: inputs:0, outputs:1 //this line used for automatic generation of GUI node
 //GUI: shortName:sine  //this line used for automatic generation of GUI node
 public:
-	AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) { }
+	AudioSynthWaveformSine_F32() : AudioStream_F32(0, NULL), magnitude(16384) { } //uses default AUDIO_SAMPLE_RATE from AudioStream.h
 	AudioSynthWaveformSine_F32(const AudioSettings_F32 &settings) : AudioStream_F32(0, NULL), magnitude(16384) {
 		setSampleRate_Hz(settings.sample_rate_Hz);
 	}