We added some basic audio channel manipulations. We have had a Mono to stereo, which basically copied the left channel to the right. This was expanded to allow copying right-to-left. In addition, now you can swap the left and right channels to correct stereo inversion using Swap channels.
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Next, we added Balance and Pan to affect the stereo "image." Both of these are keyframe-able. The difference is that Balance adjusts the apparent center, and Pan adjusts the left-right "position" of an individual channel.
Lastly, we fixed some of the SoX-based effects and removed some that were not fixable because either SoX removed them (Vibro) or they do not integrate well (Reverb and Pitch Shift) because they have time-related side effects.