Yes, I've been obsessed with visemes lately.When editing visemes, the waveforms are nice to have, but of limited usefulness.
It would really be nice if you could hear the speaking while sliding the timeline back and forth.
It would be okay (and it might even be best) if it ONLY played the audio of the CURRENTLY SELECTED AVATAR SPEECH AUDIO.
This should be something you could turn on and off.
I've done this on video editors. It's not something you use all the time, but when you do need it, it is extremely useful.
For viseme editing, it would be extremely helpful to be able to slide the timeline back and forth and here where the "V" is when saying "Whatever."
Today you have to press "Play" (spacebar), but the timeline bar moves too fast. It's hard to be accurate, and it results in a lot of trial and error.
By "SCRUBBING" I mean it plays the audio when you move the timeline, and it will play as fast or slow as you move the timeline marker.