Hi. So, I am trying to work through another patch from Maurizio Di Berardino's book, "Pure Data programming fundamentals, Vol 1" and have hit another snag. I have built the patch from page 141 (Kindle page anyway) where there are 4 MIDI notes in on 4 different MIDI channels.
Here is a screen shot of the patch:

My problem is that when I press play on Bitwig, I get the MIDI notes to channel 1 going, or I assume, they are going to the correct channel, but I am not sure. If I arm any of the other tracks, I get a flashing quickly MIDI notes and then a PortMIDI: 'Buffer overflow' as shown in the jpeg.

Is there a simple way to use Bitwig or some other app to easily demo this type of Pd patch? I am kind of stuck with it and not sure how to proceed. Reading on has not helped resolve the issue.

@playinmyblues said:

If I arm any of the other tracks, I get a flashing quickly MIDI notes and then a PortMIDI: 'Buffer overflow' as shown in the jpeg.

By "arm," do you mean enable MIDI input on the Bitwig tracks?

If you're sending MIDI out from Bitwig, there shouldn't be any need to arm anything.

I'm guessing that you've got a MIDI feedback loop somewhere. For the Pd patch, MIDI should be traveling in only one direction: DAW --> IAC bus --> Pd. This Pd patch isn't sending MIDI out anywhere, so Pd can't be the source of the loop.

"PortMIDI: Buffer overflow" isn't a Pd internal error so you'll have to address it in the way MIDI is configured in your system (DAW and OS settings).

hjh