YM_SPEAKER_MUTE
{ YM_SPEAKER_MUTE, AD1848_KIND_MUTE, AD1848_MONO_CHANNEL },
case YM_SPEAKER_MUTE:
#if YM_CD_MUTE + 1 != YM_LINE_MUTE || YM_CD_MUTE + 2 != YM_SPEAKER_MUTE || YM_CD_MUTE + 3 != YM_MIC_MUTE