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EXP input:

Can be used to externally control the rate. When an expression pedal is connected, the rate pot

can be used to define the max setting of the expression pedal.

Most commercially available expression pedals based on a potentiometer and using a TRS plug

should work. The value is not really critical, although I would not go lower than 10k.

Some examples are the Moog EP-2, Roland EV-5, and M-Audio EX-P.

You need to use TRS (Stereo) plugs and cables. NO MONO PLUGS OR CABLES! These will short

out the voltage regulators inside the pedal and damage it.

If you really know what you are doing you can actually use a control voltage instead of a

resistance based controller. But you need to consider the connections and never exceed 5V. If

you do you will damage the pedal. Use a TRS plug. No Mono plug. TRS, NOT mono :)

If you have any doubt when deciding what to connect to the expression input please send me

an email and I will verify that everything is safe.

Here is how such a TRS plug looks like.

The exp jack is connected to the pedal like this:

sleeve : ground

ring: 3.3V supply voltage

tip: controlling (varying) pin