midifile to coll

store it as text.

then you can edit it or port to coll etc.

coll would have to merge all items that occur at same time

into same line.

for example

seq :

1000 144 48 127;

1000 144 52 100;

1100 128 48 55;

1100 128 52 64;

coll :

1000, 144 48 127 144 52 100;

1100, 128 48 55 128 52 64;

using notelength like 1n is not really flexible, durations are not free at all

and would need to get quantized to available length values .

P.S. I don't see how you want to replace event time in timeline with notevalues ?