Audio Mixer Master channels wont send signals for Sidechained compressors

[MartinKvale]

Godot version

3.4.4.Stable.costum_build

System information

OSX 12.3

Issue description

We are having an issue where we have sounds coming into 2 audio buses

we got the DuckOnMusic bus and the Music Bus.

For mixing reasons we are sending the Music bus to its own MusicMaster bus where we need to get the bus signal to a compressor at the DuckOnMusic bus as illustrated above.

The expected result is that when we connect the MusicMaster bus on the compressor sidechain, is that it behaves exactly as when we connect it to the Music bus.
The actual result is that on MusicMaster bus this has no effect, and on Music bus it works as intended.

Steps to reproduce

1. download zipped project
2. open project with godot.
3. run project and press arrow up to hear gunshot sound.
4. after some seconds music starts playing, and if the bus compressor side chain input is set to music bus, your gunshot sounds are now lowered to a point where you dont really hear them anymore
5. stop the game and change the compressor sidechain input to music master, and try to run the game again.
6. this time the gunshot sounds keep playing over the music instead of getting lowered.
7. for making sure that the music signal is sent through the MusicMaster bus, I added a Pitch shift on the MusicMaster bus that you can enable to hear the music gets drastically changed while in play mode, proving that the Music bus does go through the MusicMaster bus. as seen below

Minimal reproduction project

Godot test project.zip

[MartinKvale]

I also have tried with upgrading to a new and different version and same result

[MartinKvale]

Im not sure how to get answers or confirmation on this issue, is there anyone working on the audio side of godot I could get in touch with? @Chaosus ?

[Chaosus]

@MartinKvale You can ask on https://chat.godotengine.org/channel/audio channel or find the @ellenhp which is audio maintainer.

[MartinKvale]

Thank you :)

[MartinKvale]

hey @ellenhp would you have an answer to this? ^^ checking in : )