Description:
transforms midi channel informations into midicents; ie chan 1 -> natural,
chan 2 -> +25 cents, chan 3 -> + 50 cents, chan 4 -> + 75 cents (when approx = 1/8).
When approx = 1/4 : chan 1 and chan 2 -> natural, chan 3 & chan 4 -> + 50 cents
Mode : 'keep' = chan 5, 6, 7, 8 become chan 5 + midicent increment, and so forth
'reduce' = all channels become chan 1 + midicent increment
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