pa_cvolume_set(&cvol, ss->channels, PA_VOLUME_NORM);
pa_sw_cvolume_multiply_scalar(&cvol, &cvol, vol);
pa_threaded_mainloop_lock(s->mainloop);
pa_cvolume_set(&cvol, ss->channels, PA_VOLUME_NORM);
pa_sw_cvolume_multiply_scalar(&cvol, &cvol, vol);
pa_threaded_mainloop_lock(s->mainloop);