AudioEffectCapture not working correctly with 2 channel microphone

[Sheppowed]

Tested versions

• Found in Godot 4.3-stable
• Reproducible in Godot 4.2

System information

Windows 11

Issue description

When getting buffer data with get_buffer(1024) from a AudioEffectCapture and playing it back on a AudioStreamGeneratorPlayback , the voice heard is heavily distorded. This seems to occur when the microphone is in ‘2-channel 24-bit’ configuration

With a ‘1 channel 16 bit’ microphone, I don't have this problem.

here is an example :
https://github.com/user-attachments/assets/5f9e9031-54d2-48b5-8a3a-72a7dce8b117

In my personal case, the problem occurred with the microphone "FIFINE K688" (2-channel mic) and the microphone of my Headset (Steelseries Arctis Nova Pro).

Steps to reproduce

Set up a basic microphone playback system with an AudioEffectCapture and an AudioStreamGeneratorPlayback

use two different types of microphone (a ‘1 channel’ and a ‘2 channels’) and listen to the final result

Minimal reproduction project (MRP)

audiobugtest.zip

[fire]

See also #99875 which needs help getting completed