@willblackhurst I'm just turning knobs and sliding sliders. I wouldn't think that would send a huge number of MIDI messages to pd. The Midimax has a button that sends the states of all the controls. When I press that button, it sends 59 MIDI messages to pd at the same time. That doesn't cause this problem. I'm not sending any MIDI messages to the Midimax from pd.

When the problem happened, pd not only stopped responding to MIDI messages. It stopped responding to mouse clicks and everything else.

While using an Akai Midimix controller, PD stopped working, and the message, "warning: MIDI timing FIFO overflowed" appeared on the console. What caused this? How can I prevent it from happening again? I'm using vanilla 0.56.5 on Windows. Most of the time it works fine, but this has happened a couple of times. I've got a live performance coming up in a couple of weeks, and I don't want PD to fail during the performance.

Someone on reddit asked how to take different actions when an arrow key is pressed, depending on whether the shift key is up or down. Since I can't post a patch there, I'm posting a sample patch here.

shift_test.pd

@hansr Fascinating sounds!

For some reason, my post with a Bandcamp link doesn't show up here. Does anyone know whether there is a problem with pdpatchrepo.info? This post is the only new post that has shown up in the past 10 days.

@jameslo Your expr~ version has some interesting properties. When I input a sine wave and set $v2 to an odd integer, the output is a sine wave whose frequency is $v2 times the original frequency. You would never get sine wave output from traditional wavefolding implementations. When $v2 is an even integer, you get odd harmonics (as expected) with a peak at the $v2-1 harmonic. I'll continue to use traditional techniques for wavefolding, but I think your expr~ could be very useful for something else I'm working on. Thanks for posting it!

Edit: I've been experimenting more with this. The behavior I described above occurs when the input sine wave has an amplitude of 1 to -1. If the amplitude is less than that, you get a limited number of harmonics. For example, if the sine wave's amplitude is 0.99 to -0.99, and $v2 is an odd integer, you get a large peak at the $v2 harmonic, small peaks at lower harmonics, and no peaks at higher harmonics.

@kyro Thank you!

@kyro This looks interesting. Do you have a sample patch?

I found a way that works:

@whale-av Thanks. Where would I get concat? It isn't listed in deken. Is there a way to do this in vanilla Pd?