CTL_APP_LEVEL
ctl_onval(CTL_APP_LEVEL, o, a, vol);
case CTL_APP_LEVEL:
case CTL_APP_LEVEL:
case CTL_APP_LEVEL:
case CTL_APP_LEVEL:
case CTL_APP_LEVEL:
ctl_del(CTL_APP_LEVEL, o, a);
ctl_new(CTL_APP_LEVEL, o, a,
ctl_onval(CTL_APP_LEVEL, o, o->app_array + chan, msg[2]);