MXR Blue Box; mod to force it to glitch?

[hedroom]

Hello folks.

New around here, I'll introduce myself properly soon with some pics of my first two builds ever! Just wating for some decal printing materials then I'm done.

But for now. One of the above builds was an MXR Blue Box. I really like it when it glitches, ie jumps between octaves. It would be cool to have that as an option on a switch. Press and hold the switch and it starts glitching, release and it continues with what ever it was doing before ( ... glitching probably, lol!). Is that a "momentary switch" btw? It would be just at the end of the pedal beneath the stomp switch so you could operate it with your toe.

How might I go about forcing it into glitch mode? ... perhaps that's as problematic as making it behave?!

I did the Mark Hammer mod (1oct down as well as stock 2oct down) ... it would be cool to have that under footswitch control too. During a big held note you could tap out some nice rhythmic octave jumps with yout toe.

Wow ... building your own pedals, it's like being in a toy shop where they'll make anything you want 

//
Hedroom

[KerryF]

its a momentary switch you want.

welcome 

[Processaurus]

I like your thinking Mr. Hedroom, most people want the blue box to behave better, not worse.  The glitches are great, I've mused about how to force it to glitch "reliably" on demand.  One thing that makes it freak out is if there is a lack of a clear fundamental bass frequency to track, that could be achieved easily with a tiny input cap, to filter out the lows and just leave harmonics.  Using a spdt momentary stomp switch like Small Bear Electronics sells as a normally closed spst switch would work, the way I would do it to put the tiny cap in series with the normal cap, and have the stompswitch shorting the tiny cap until it gets pressed, so when the switch gets held down the contacts open, forcing the audio to go through the small cap.

Another way to get farther out there glitches is to feed some of the output back to the input.  Try connecting a 1 meg pot wired as a variable resistor between the top of the volume control (R21 lug 3) and the junction of R3 and C1, looking at the tonepad schematic.  Use the momentary spdt stomp switch as a normally open switch, so when you press it it connects the 1 meg pot (or trim pot if you don't want another hole) to the R3 C1 junction.

I did the feedback mod on a momentary switch on this pedal I made a while ago, worked great.

Good luck!