I just returned from their office. The engineer there said that the reason some units passed the QA process was because the AV unit was grounding the circuit in the pedal.

They are already aware of the issue, however there are a problem units still in circulation.

I was given a replacement unit that was already tested so I will get to try it myself when I get home.

So I guess the lesson here is to solder the ground yourself, or get it replaced if it is under warranty.

Good luck.

I have the exact same error with the Guitar version of the Micro Synth XO. Please read the email I sent them.

“Hi,

I am writing in regards to an issue I have with two pedals sent to me from Guitarcenter’s online store.

The Micro Synth XO pedal I received does not stop humming. This prevents any signal but the buzzing from going to my amp. I initially thought it could be a grounding problem, but I do not have trouble with any of my other pedals. I noticed when I touched the cable plugs simultaneously on input/output end the humming went away, but still no sound.

I found one work around by using a Boss NS-2 noise suppressor in a loop. It actually eliminated the humming and allowed normal functionality. I still felt something was wrong, so I returned the Micro Synth to GuitarCenter.com. They sent me a new Micro Synth with the exact same problem.

At this point I thought that maybe connecting the input and output cable ends together with a conductor (3rd cable touching the nuts on either end of the pedal) would resolve the problem. It did get rid of the humming and allowed normal functionality. The NS-2 did not actively get rid of the humming, it just allowed the input and output to be shorted.

I have a few questions;

1) Is there something wrong with these two units I received?
2) Is there a way to fix this humming issue permanently?
3) What is my best course of action? I’d rather not have to go through the shipping exchange process again with GuitarCenter.com.

Thank you for your time,

“