[PD] midi input overload?

Ingo ingo at miamiwave.com
Thu Jun 27 16:18:18 CEST 2019

The MIDI bus can transmit a maximum of a little more than 1,000 (3 byte) 
events like notes, CCs, polyphonic aftertouch per second.
Channel aftertouch and program changes use 2 intead of 3 bytes. So the max 
number of those can go up to about 1,500.

I made myself a counter to check how many MIDI messages are coming in per 

Another issue is that not every MIDI interface can handle the full MIDI 
If you have one of those cheap chinese no name interfaces they might cause 
Even some good brand interfaces can have problems.

In some cases you can experience compatibility isses between two different 
MIDI interfaces.

If you are sending MIDI to a USB interface during booting your computer the 
internal buffer of the interface will be filled up and MIDI might not work 


> -----Original Message-----
> From: Pd-list [mailto:pd-list-bounces at lists.iem.at] On Behalf Of
> rolfm at dds.nl
> Sent: Wednesday, June 26, 2019 4:12 PM
> To: pd-list at lists.iem.at
> Subject: [PD] midi input overload?
> hi list
> i'm trying to work with MIDI.
> the problem i meet is that the midi input very quickly is overloaded.
> i have to (re)select the MIDI input channel to continue.
> this happens even without a patch, just in de midi-help.
> input is coming from a Behringer or from Ableton.
> (Pd-0.49 on Mac and on Windows 10)
> rolf
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