Setting the volume on an AudioInstance instead of PlayAudioCommand doesn't set it relative to a channel.

[Selene-Amanita]

Follow up of #103 / #106

If you have an AudioChannel called my_audio_channel with volume 0.5 let's say.

The fix works if you do my_audio_channel.play(my_handle_audio_source).with_volume(0.2);, it would set the volume to 0.1, as expected.

But if you do:

    let my_handle_audio_instance = my_audio_channel.play(my_handle_audio_source).looped().paused().handle()
    ///...

/// Then in another system
fn other_system (
    mut audio_instances: ResMut<Assets<AudioInstance>>,
    //...
) {
    //... get my_handle_audio_instance somehow
    let sound = audio_instances.get_mut(my_handle_audio_instance).unwrap();
    sound.resume(AudioTween::default());
    sound.set_volume(0.2, AudioTween::default());
}

then the volume will be set to 0.2 instead, I think, I do basically that and when the volume of the channel is 0. I still hear the sound.

[NiklasEi]

Yes you are right, this was an oversight on my end in #106. Thanks for the issue, I will adapt the behavior for setting the volume on an instance.