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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