endpoint AudioManagerServer
{
    set_main_mix_muted(bool muted) => ()
    is_main_mix_muted() => (bool muted)
    get_main_mix_volume() => (double volume)
    set_main_mix_volume(double volume) => ()
    
    // Audio device
    set_device_sample_rate(u32 sample_rate) => ()
    get_device_sample_rate() => (u32 sample_rate)
}