Midi clock to tap tempo input of a delay pedal

#1

Hi.

I would like to use my Axoloti to sync my analog delay pedal to the midi clock coming from my Digitakt. The delay pedal (DOD Rubberneck) has a tap tempo input that only needs to be operated with a momentary switch.

How would I go about mimicking the press of a momentary switch from the Axoloti?

So far I would suggest a Midi Clock object connected to a digital pin out object. The output of the digital pin would the be connected to the actual delay pedal tap tempo input.

Does that make sense?

Best

#2

You'll need an extra circuit to do this. The switch in the circuit of your pedal needs to be replaced with a voltage controllable switch.

You can use a transistor as a switch for instance, or use a CD4016 IC which has 4 switches.

#3

Perfect - will try that.

thanks for helping out :slight_smile:

#4

Wouldn't it also work with an optocoupler, like a 4N25?
I used some of these to trigger buttons on an old drum machine, I also have one or two on my Axoloti that do exactly what you are asking for.

Wiring these is really straight forward, maybe add a 220 ohm resistor before the input of the 4n25.

#5

Cool! What do you mean by the input? On the axoloti side or on the “button” side of the circuit?

Best

#6

Before the input of the 4n25.
Pin 1 of this schematic https://www.enovatera.com/5464-large_default/enovatera-4n25-opto-coupleur-a-sortie-transistor-discount-prix-acheter-4n25.jpg

I remembered I used 4n25 to do the opposite with my AXO: take the trigger from another device and use the 4n25 to act like a switch in the Axoloti patcher.

It should work the other way around though, the 4n25 is an octocpoupler, meaning it acts like a switch when the led inside is powered. If you wire it like a led it should work I guess?
you should try this on breadboard.

#7

Brilliant - thanks again for your help. I love this forum :grinning:

#8

The Rubberneck delay pedal already has a TRS input designed to be used with a Digitech FS 3X triple footswitch pedal - connected via a TRS cable to control tap tempo, the "rubberneck" effect (a momentary change of delay time) and modulation on/off.

I guess it's not neccessary to mod the Rubberneck pedal then, is it? Wouldn't it be enough to connect a GPIO out to the pedals input jack as @gutterne1983 intended?

#9

Didn't know it had a TRS input. But just using a GPIO and inserting a voltage into the TRS input might not work.
Depends on how the pedal works. Since the pedal has 3 buttons, it probably doesn't connect the ring or tip to ground to close a circuit.