FXBUS_PCM_LEFT
A_C_00000000, A_FXBUS(FXBUS_PCM_LEFT), &pc);
FXBUS(FXBUS_PCM_LEFT), C_00000004, &pc);
FXBUS_PCM_LEFT << 16 | FXBUS_MIDI_REVERB << 24;
FXBUS_PCM_LEFT << 8 | FXBUS_MIDI_REVERB << 12;