Comment #10 on issue 687 by adam.spiers: Enhancement: inequal MIDI quantization of equal durations (swing, rubato)
http://code.google.com/p/lilypond/issues/detail?id=687
I like the misshapen cam analogy :-) However I'm not sure it's universally applicable, because as observed in comment 5, there are cases where you want to displace the starts/ends of notes of a certain length, but not of another length. For example, triplet 8th notes (or four 16th notes) would probably be played straight rather than swung when played over swung duplet 8th notes. That is a matter of taste and is impossible to predict, which is why I proposed a tight selection criteria for which MIDI events get displaced. I thought it would be better for the user to encounter some displacements missing than experience unwanted ones, since it's probably easier to add more to the list than figure out which ones to remove.
By the way you can think of this problem as being equivalent to having two turntables being simultaneously driven, but only one of them has a misshapen cam :-) Or even multiple turntables with differently misshapened cams ...
Another thing to bear in mind is that your example chooses a denominator of a quarter note, but this must not be hardcoded otherwise it will not cater for all scenarios.
I like your idea of composing the swing displacement map function with another global factor between 0 and 1 - this would allow users to load preset swing maps (e.g. Viennese waltz) and then independently tune how much of an effect the preset has on playback.
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