if (joined) {
#ifdef ALSAMIXER_GUI
for (chn = snd_mixer_selem_channel_id_t(0); chn < SND_MIXER_SCHN_LAST;
snd_mixer_selem_channel_id_t(int(chn)++))
snd_mixer_selem_channel_id_t(int(chn)+1))
#else
for (chn = 0; chn < SND_MIXER_SCHN_LAST; chn++)
#endif