* define is matrix has ghost (unlikely)
* `#define DIODE_DIRECTION COL2ROW`
* COL2ROW or ROW2COL - how your matrix is configured. COL2ROW means the black mark on your diode is facing to the rows, and between the switch and the rows.
+* `#define DIRECT_PINS { { F1, F0, B0, C7 }, { F4, F5, F6, F7 } }`
+ * pins mapped to rows and columns, from left to right. Defines a matrix where each switch is connected to a separate pin and ground.
* `#define AUDIO_VOICES`
* turns on the alternate audio voices (to cycle through)
* `#define C4_AUDIO`