DEG180            122 sound/usb/caiaq/input.c #define DEG270		(DEG90 + DEG180)
DEG180            123 sound/usb/caiaq/input.c #define DEG360		(DEG180 * 2)
DEG180            164 sound/usb/caiaq/input.c 		pos_a = HIGH_PEAK - a + DEG180;