Thank you! Yes, a few of the videos have chords marked on tab tracks (e.g., "Chord fingering" on http://www.soundslice.com/yt/Y6ti5f-LHp4/) but I'm planning to add a first-class chord track type.
To exit looping mode, just press Pause? Or were you just trying to clear a selection? (If the latter, just click anywhere in the timeline canvas.)
I have searched high and low for a fix to that two-fingered left scrolling in Chrome, and there doesn't appear to be a way to fix it. :-( If anybody knows, please tell me!
2-finger scroll: I'm pretty sure this happens when there are no unscrolled bars under the cursor - so how about an old-school JS hack (remember those?):
1) put the annotation inside a container (and make that position:relative); annotation position:absolute, right:0px;
2) autoscroll the container
3) add some JS to infinitely increase the width of the container on a left-ish mouse move. (I think this will still work even if the container is, itself, in a cropping container.
I suspect the result will be that 2-finger left swipe will be like quicksand - no apparent movement. Kind of sucks, but less than losing your page.
An alternative would be to make history back/forward suck less: keep the display state in local storage and render a page just as it was the last time a person saw it (in terms of time display, modes, and selections).
Probably that's a useful thing to do anyway and has Least Surprise in its side.
Calling preventDefault on the mousewheel event stops swipe navigation in Chrome. You may want to restrict this to when the tab pane's scroll position is 0.
Possible bug report: I couldn't figure out how to exit looping mode, and had to refresh the page.
Not sure if you can fix this: two-fingered left scrolling in the tab area activates my browser's "back" function.