OPL4_REG_F_NUMBER 447 sound/drivers/opl4/opl4_synth.c snd_opl4_write(opl4, OPL4_REG_F_NUMBER + voice->number, voice->reg_f_number); OPL4_REG_F_NUMBER 519 sound/drivers/opl4/opl4_synth.c snd_opl4_write(opl4, OPL4_REG_F_NUMBER + voice[i]->number,