MIDI timing issues when the window is unfocused

[MarkMendell]

Video (1.7MB)
(Chrome, 10.10.5 OSX)

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^^^ We do the two clock method for scheduling so that playback can stop. When unfocused, the setInterval loop gets called in a larger interval than its lookahead is. Easy fix would be to increase the lookahead amount (I changed PLAYBACK_LOOKAHEAD in js/playback.js to 1000 and there were no more timing issues) but that then makes pausing/stopping less responsive.

Maybe there's a way to detect if the window is unfocused, then increase the delay only then? As long as it doesn't add too much complexity, I think this would be the best option. Another option is to let the users set their own lookahead, but then that adds complexity to the UI.