Forums > MaxMSP

Removing extraneous MIDI messages

September 5, 2013 | 7:17 am

I’m trying to create a patch that will use midi note-on / note-off signals to send a simple OSC command. [ex. /light1/on, light1/off]. However I am getting multiple note and velocity messages when I hit a key. Here are some examples of an OSC data monitors reaction to notes being played. The patched used for this was a simple notein connected directly to a udpsend.

This is a note pressed once and held for a few seconds then released:

This is a note quickly tapped twice:

Could someone please explain this behavior and what I could do to resolve it? I’ve seen in the tutorials information about setting note off on a timer but I don’t think I should need to do that. I would think I could hold a note for hours if needed. Thank you for your help!

-JC


September 5, 2013 | 7:21 am

Ok I guess it didn’t like my imgur links. I guess I’ll try attachments. The basic idea is a note held for a long period of time sends a single note with a velocity on press and then the note with a velocity of 0 on release. Tapping a note creates more than one instance of those messages. The example here is a note being tapped twice and THREE sets of note / velocity messages being sent.

Attachments:
  1. notetappedtwice
  2. noteheld

September 5, 2013 | 8:16 am

Assuming you are using a Midi keyboard, this *could* be a symptom of ‘contact bounce’ – in other words, a small time period in which the key contact is considered made, broken and made again etc- thus sending multiple note on/off messages – in which case you would need to apply some kind of ‘debouncing’ algorithm to your input. Perhaps you could try sending your note/velocity pair -> [thresh 50] -> [zl change] and see if that makes any difference…


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