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exp input:
Can be used to externally take over the ctrl knob's function. When an
expression pedal is connected, the the control knob can be used to define
the max setting of the expression pedal.
Most commercially available expression pedals 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 1/4 inch TRS (Stereo) plugs and cables. NO MONO PLUGS
OR CABLES! These will short out the voltage regulators inside the pedal
and damage it.
Here is how such a TRS plug looks like.
- tip: controlling pin
- ring: 3.3V supply voltage
- sleeve : ground
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 3.3V. 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.
Power Supply:
The power supply needs to be 9V/120mA center negative like the com-
monly used guitar pedal power supplies:
Make sure the polarity of your power supply is correct or it will damage
the pedal. Do NOT run at higher voltages.
As the pedal uses a digital processor operating at high frequencies, you
may hear some noise if you use it together on the same power supply
with other pedals (daisy chained) even when it is bypassed. The noise
can bleed through the power supply into the other pedal's signal. This
is normal for such devices. It might not be the case in your particular
setup but if you notice that, I would suggest using an isolated power
supply.
Notes:
- When connecting different equipment, you might run into issues
with hum caused by a ground loop. If that's case you may need to
use a ground loop isolator (usually consisting of transformers)
- If the wet and dry signal of a channel are very similar (for ex. when
the effect is not being triggered) you will hear some phasing between
the 2 signals. This is caused by the processed signal being slightly
phase shifted through the DSP compared to the analog dry signal. I
could not really find a practical way to avoid this so I decided to just
live with it, hope you will too.
Thanks !
David
https://www.davidrolo.com