From a69da0b47ec082a411ac93de38ef0f16c52a08fe Mon Sep 17 00:00:00 2001
From: Holger Wirtz <wirtz@parasitstudio.de>
Date: Thu, 24 Oct 2019 08:20:17 +0200
Subject: [PATCH] Fixing AudioEffectStereoMono.

---
 effect_stereo_mono.cpp | 16 ++++++----------
 effect_stereo_mono.h   |  9 +++++----
 2 files changed, 11 insertions(+), 14 deletions(-)

diff --git a/effect_stereo_mono.cpp b/effect_stereo_mono.cpp
index 3d1038d..2d60188 100644
--- a/effect_stereo_mono.cpp
+++ b/effect_stereo_mono.cpp
@@ -38,23 +38,19 @@ void AudioEffectStereoMono::update(void)
 {
   audio_block_t *block[2];
 
+  block[0] = receiveWritable(0);
+  block[1] = receiveWritable(1);
+
   if (_enabled == true)
   {
-    block[0] = receiveWritable(0);
-    block[1] = receiveReadOnly(1);
-
     if (block[0] && block[1])
     {
       int16_t *bp[2] = { block[0]->data, block[1]->data };
 
       for (uint16_t i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
       {
-        *bp[0] = (long(*bp[0]) + *bp[1]) >> 1;
-        *bp[1] = *bp[0];
-
-        // push the pointers forward
-        bp[0]++; // next audio data
-        bp[1]++; // next audio data
+        *bp[0]++ = *bp[0] >> 1 + *bp[1] >> 1;
+        *bp[1]++ = *bp[0];
       }
     }
   }
@@ -66,7 +62,7 @@ void AudioEffectStereoMono::update(void)
   }
   if (block[1])
   {
-    transmit(block[1], 0);
+    transmit(block[1], 1);
     release(block[1]);
   }
 }
diff --git a/effect_stereo_mono.h b/effect_stereo_mono.h
index 8e225cb..0379326 100644
--- a/effect_stereo_mono.h
+++ b/effect_stereo_mono.h
@@ -31,17 +31,18 @@
 // Written by Holger Wirtz
 // 20191023 - inital version
 
-class AudioEffectStereoMono :
-  public AudioStream
+class AudioEffectStereoMono : public AudioStream
 {
   public:
     AudioEffectStereoMono(void):
       AudioStream(2, inputQueueArray)
-    { _enabled=false; }
+    {
+      _enabled = false;
+    }
 
     virtual void update(void);
     virtual void stereo(bool mode);
-    
+
   private:
     audio_block_t *inputQueueArray[2];
     bool _enabled;