channel bug fixes

src/effect_gainStereo_F32.h

@@ -78,7 +78,7 @@ public:
 	{
 		float32_t gL, gR;
 		pan = constrain(p, 0.0f, 1.0f);
-		mix_pwr(pan, &panR, &panL);
+		mix_pwr(pan, &panL, &panR);
 
 		gL = panL * gain;
 		gR = panR * gain;	

src/filter_DCblockerStereo_F32.h

@@ -130,8 +130,8 @@ public:
 		xRegR = _xRegR;
 		yRegR = _yRegR;
 
-		AudioStream_F32::transmit(blockL, 0); // send blockL on both output channels
-		AudioStream_F32::transmit(blockL, 1);
+		AudioStream_F32::transmit(blockL, 0);
+		AudioStream_F32::transmit(blockR, 1);
 		AudioStream_F32::release(blockL);
 		AudioStream_F32::release(blockR);
 

src/switch_selectorStereo_F32.h

@@ -50,14 +50,10 @@ public:
 		blockL = AudioStream_F32::receiveWritable_f32(0);
 		blockR = AudioStream_F32::receiveWritable_f32(1);
 
-
 		if (!blockL || !blockR)
 		{
 			if (blockL) AudioStream_F32::release(blockL);
 			if (blockR) AudioStream_F32::release(blockR);
-
-
-
 			return;
 		}
 		switch(mode)