How to Troubleshoot pedalSHIELD UNO

i've problems with tremolo and fuzz but with fuzz the problem is different. When i play softly it doesn't sound

Hi, I've got an issue + a few suspicions as to why it might not be working. Sorry if this isn't the right place to post... I'm new to this site (and forums in general!) I'll re-post in the correct location if directed

I recently purchased the UNO shield and assembled it today. I'm newish to soldering, but I've had enough practice to make this an easier project in terms of construction. Looks good to my eyes.

I uploaded the code to a knock-off Arduino Mega -- I'm thinking this might be my issue, since my research has revealed there are very slight differences between the UNO and the Mega that might make some shields not work, even if they fit. Code uploaded fine. I tested the "clean" sample, and it seemed like everything was working. Hit the foot switch, LED came on, guitar signal was cut off. Hit it again, LED off, guitar back on. Cool!

I tried the boost code next. Uploaded fine again. Behavior-wise, it seemed to operate the same as the clean code, which seemed strange but I figured it was my ears. Moved on to the distortion code, also behaved like the clean code.

Any ideas what's going on? I haven't looked that deeply into the code yet, but I'm suspecting that there's a PWM/pin difference between the UNO and Mega that's causing no effects to actually take place... but then again I'm not entirely sure. This thing's only been in my possession for about 7 hours...

I'd appreciate any and all help! Thanks in advance

Hi all,
I'm stuck and need help. I've soldered all the components, attached an Arduino Uno, & plugged the whole thing in. The pedal toggles the LED on & off, and the underlying Arduino is working fine, but no sound passes through the board.

I have:

• checked every soldering point about a dozen times
• made sure that every component is oriented correctly
• tested each 1/2 inch cord (just to make sure that wasn't the problem)
• tested that the GND, 2.5V, & 5V test point are correct

But still, no signal passes from the guitar to the amp.
I can't get the sine wave generator to work, so the output stage seems like the problem. But, I've looked it over and can't find any problems with parts, orientation, or joints. I've attached a few pictures. Please help

Thanks in advance!