Currently, we draw every audio channel into the clips, which takes more vertical space and makes them look squeezed, especially if the source is 6 channels.

I think we should only have one single waveform (downmix to mono for analysis):
- we're mostly interested in the loudness/amplitude/volume of the sound
- having only the sum of the channels being drawn as a single waveform allows a more general overview of the clip's loudness, and gives us more "dynamic range" or precision because it has the 100% of the clip height to "stretch" on (instead of being a fraction of the height). So with waveform instead of 2, you have 2 times more space to draw it. This is especially nice for "voice" clips taken from unamplified camcorders that are sometimes barely visible.
- we're not an audio sample editor (ie: Audacity) and we don't really need to see all the channels?