Feature Request - Fully disable Speex preprocessing

Speex preprocessing noticeably reduces sound quality. I've received some comments that Mumble doesn't sound as good as some other VOIP options. To test, I removed all Speex preprocessing in the source, and sound quality was better than anything we've ever tested.

It might be specific to our environment/equipment, as some microphones don't seem to be affected as much.

Would love to see an option for this under the Audio Processing settings. Or perhaps disable Speex preprocessing completely whenever the user sets Noise Suppression to Off.

Thanks!