message: AIC3206: improve comments
diff: /*
  control_tlv320aic3206
  - Created: BPF@creare.com Jan-Feb 2017
  -
  - Purpose: Control module for TLV320AIC3206 compatible with Teensy Audio Library
  + Created: Brendan Flynn (http://www.flexvoltbiosensor.com/) for Tympan, Jan-Feb 2017
  + Purpose: Control module for Texas Instruments TLV320AIC3206 compatible with Teensy Audio Library
  License: MIT License. Use at your own risk.
  */
  @@ -40,11 +39,13 @@ private:
  #define TYMPAN_OUTPUT_HEADPHONE_JACK_OUT 1
  -#define TYMPAN_INPUT_LINE_IN 0
  -#define TYMPAN_INPUT_JACK_AS_MIC 1
  -#define TYMPAN_INPUT_JACK_AS_LINEIN 2
  -#define TYMPAN_INPUT_ON_BOARD_MIC 3
  +//convenience names to use with inputSelect() to set whnch analog inputs to use
  +#define TYMPAN_INPUT_LINE_IN 1 //uses IN1
  +#define TYMPAN_INPUT_ON_BOARD_MIC 2 //uses IN2 analog inputs
  +#define TYMPAN_INPUT_JACK_AS_LINEIN 3 //uses IN3 analog inputs
  +#define TYMPAN_INPUT_JACK_AS_MIC 4 //uses IN3 analog inputs *and* enables mic bias
  +//names to use with setMicBias() to set the amount of bias voltage to use
  #define TYMPAN_MIC_BIAS_OFF 0
  #define TYMPAN_MIC_BIAS_1_25 1
  #define TYMPAN_MIC_BIAS_1_7 2
  