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Convert Coll list into midi file that seq will play

Apr 11 2012 | 10:24 am

This one is driving me mental!

I have an original saved midi file that plays fine through the seq object. The idea is to randomise the notes but keep the same rhythm and timing as the original file. Using detonate and coll I have managed to randomise the note/velocity data and glue it back onto the time parameter output.

Now I have a coll with a long list like this.

(eg 4 = note on 4ms from start of seq; 92 43 = note/velocity; 10 = duration)
1, 4 92 43 10;
2, 241 99 56 72;
3, 466 60 38 225;

So my question is can I make a midi file from this data that seq will understand?

I have tried feeding it back into detonate but I want the original midi file to play alongside the randomised midi file with the ability to switch between the two in real-time…



Apr 11 2012 | 11:39 am

Why don’t you create the randomized version as a new midi file (coll > detonate > file)?
Then you could play it alongside the original one using seq.

Apr 11 2012 | 12:15 pm

Hi Broc,

Sorry didn’t explain exactly what I wanted…

When I load in the original midi file I wanted the randomised version to be created immediately ready for playback.

Am I right in thinking that with detonate I would need to record the new sequence back before I could use it?

Apr 11 2012 | 1:47 pm

You could also play the coll data directly, like this

-- Pasted Max Patch, click to expand. --

Apr 11 2012 | 5:56 pm

I agree with just playing back using the coll. I have an example, called CollSeq that does this sort of thing, which can be found here:

Apr 12 2012 | 9:52 pm

Broc thanks for your patch, it did work but I’ve ended up using the excellent CollSeq from Chris…. Problem solved works perfectly… much appreciated..


Apr 12 2012 | 10:46 pm

seq is a really dumb object. forget it – and use detonate.

with detonate you would eventually no longer want to randomize or resort
the events in the stored data – but rather PLAY the data randomised or
resorted right from the stored data in the object in realtime.

this is much easier AND allows for more flexibilty.

for reading consecutive data from detonate including the delta time just connect
the time output to the "next" message (this is kind of missing the helpfile imo)


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Forums > MaxMSP