* `#define B7_AUDIO`
* enables audio on pin B7 (duophony is enables if one of B[5-7]\_AUDIO is enabled along with one of C[4-6]\_AUDIO)
* `#define BACKLIGHT_PIN B7`
- * pin of the backlight - B5, B6, B7 use PWM, others use softPWM
+ * pin of the backlight - `B5`, `B6`, `B7` and `C6` (and `D4` on ATmega32A) use hardware PWM, others use software implementation
* `#define BACKLIGHT_LEVELS 3`
* number of levels your backlight will have (maximum 15 excluding off)
* `#define BACKLIGHT_BREATHING`