Fix experimental audio volume being significantly too low (#38062)

The rodio channelcount convertor halves the volume. This addresses that
in most cases by using the default channelcount for the system
microphone which is usually 2.

A proper fix will follow later as part of the de-noising PR

Release Notes:

- N/A
687c2c88c7David Kleingeld committed on 9/12/2025, 1:56:48 PM· committed by GitHubparent2a03b6b
1 file changedLine totals unavailable