message: AudioSwitch_F32: improve setChannel()
diff: @@ -31,9 +31,9 @@ public:
  virtual void update(void);
  - void setChannel(unsigned int channel) {
  - if (channel >= 4 || channel < 0) return;
  - outputChannel = channel;
  + int setChannel(unsigned int channel) {
  + if (channel >= 4 || channel < 0) return outputChannel; //invalid! stick with previous channel
  + return outputChannel = channel;
  }
  private:
  