Cannot map control to audio mixer channel levels

[trevorparscal]

Describe the bug
The audio mixer node does not allow mapping a controller to any of the level controls.

To Reproduce
Steps to reproduce the behavior:

1. Create an audio mixer node.
2. Create a controller with at least one control.
3. Click learn.
4. Move a level control in the audio mixer node.
5. Move the physical control.
6. Observe no connection is made.

Expected behavior
Audio mixer node levels should be controllable parameters.

Desktop (please complete the following information):

• OS: macOS Big Sur 11.2.1
• Version 1.45.1-d3f2ee9

Standalone or Plugin
Standalone (plugin not tested)

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[pranavmayuram]

Would like to re-surface this bug. Looking to automate the various track level parameters in Audio Mixer ideally via my DAW. Alternatively, currently have to add a gain node for all tracks going into the Audio Mixer if I'm not mistaken.

As shown in the image, currently you can only automate Audio Mixer "Master Mute" and "Master Volume" currently.