tda7432_write
tda7432_write(sd, TDA7432_LF, lf);
tda7432_write(sd, TDA7432_LR, lr);
tda7432_write(sd, TDA7432_RF, rf);
tda7432_write(sd, TDA7432_RR, rr);
tda7432_write(sd, TDA7432_VL, volume);
tda7432_write(sd, TDA7432_TN, 0x10 | (bass << 4) | treble);