AUDIO_MUTE
case AUDIO_MUTE:
set_audio( bktr, AUDIO_MUTE ); /* prevent 'click' */
temp |= AUDIO_MUTE;
set_audio( bktr, AUDIO_MUTE );
set_audio(sc, AUDIO_MUTE);
SE_SF(DP_SYM32_ENC0_DP_SYM32_ENC_SDP_AUDIO_CONTROL0, AUDIO_MUTE, mask_sh),\
type AUDIO_MUTE;\