midisyn_vol2cB
ms->voices[voice].velcB = midisyn_vol2cB((uint_fast16_t)vel << 7);
ms->chnstate[chan].volume = midisyn_vol2cB(
ms->chnstate[chan].expression = midisyn_vol2cB(
extern int16_t midisyn_vol2cB(uint_fast16_t);