I need to populate a list with the MIDI notes that are being pressed, and remove the note from the list when the key is released.

One idea is to use [notein], and if the velocity is> 0 then add the note to the list, and if the velocity == 0 then remove the note from the list. But I have no idea of how to implement this.

I think I need [list-extend], [list-find], and [list-delete], but I just can't figure out an implementation.

How can I do this?

EDIT: solved the problem and have a working patch. See my reply below for details.

@JCPedroza said:

How can I do this?

[stripnote] ?

Cheers~

I finally solved this.

Used a combination of [list-extend], [list-find], [list-delete] for the list dynamics and [notein] for MIDI input. The patch first separates the MIDI note messages by velocity (0 velocity is note-off). If note-on then it adds the note to the list, if note-off it removes the note from the list.

When the patch receives a bang, it outputs the list with all the keys (MIDI notes) that are being pressed.

You can get the patch at: http://pdpatchrepo.info/patches/patch/163

There are two important subpatches. [pd on_off_route] routes the MIDI-note-on notes to one side, and MIDI-note-off notes to the other. [pd list-deletevalue] deletes a value from a given list, outputs the list unchanged if the value was not found.

It surely can be improved. Let me know if you find something.

Thanks everyone for your time and help, I really appreciate it.

...sorry link don't work...

@gema You mean JCPedroza's link? Yes it does work, it opens the .pd file as a text on my Firefox. Just save that file as anything.pd, or alternatively right click on the link and click save link as...

Take care,
Gilberto

@JCPedroza I just approved your patch on http://pdpatchrepo.info/patches/patch/163
Thanks for sharing!
Cheers~

Two other suggestions were given in the mailing list that are better than my solution.

One improves mine by simplifying it and using vanilla objects only, and the other took a completely different approach using [bag].

You can find all solutions at https://github.com/JCPedroza/puredata/tree/master/midi/listOfMIDINoteOn (to get a patch click the file, click "raw", then save as)