Supposedly a NPD, but mostly left me confused (Seymour Duncan Vapor Trail)

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So I bought a used delay pedal, a Seymour Duncan Vapor Trail, last week and was quite confused when I started to test it.

Why I got this pedal is for several reasons; a bit brighter repeats than an MXR Carbon Copy, top mounted jacks, modulation settings on the top of the pedal, a blinking LED that tells you the delay time and a cool fx loop/multipurpose jack on the side for shenanigans.

It had a battery (I think dead) installed when it arrived that I removed. Then I also had to remove a fair amount of gunk (clean your pedals before selling, pretty please!).

When I tried to power on the pedal, it wasn’t working in a couple of ways. First, the Mix knob didn’t work and the repeats could just barely be heard in the background. Felt like it was stuck in the lowest Mix position or something.

Second, the delay time LED wasn’t blinking at all.

First I thought the pedal was a total bust, but to see if anything else was broken I plugged in a reverb pedal in the FX send/return that’s on the side of the pedal. By that the Mix knob came to life and started working, and kept working after unplugging the side jack as well. Maybe something wrong with the function switching regarding the jack, since you can plug in a volume/expression pedal to control Mix as well?

The weirdest thing after this is that during the next maybe 10 minutes the LED started blinking. First faintly and irregularly, then as it should. The rest of the knobs were working throughout.

I don’t know now what to think of the pedal. I tried powering it on later and it seems to work. Since I bought it from a store I can send it back, but now it actually works… And it does sound like I expected, which is quite nice.

Any electrical geniuses that could help speculate into what’s been going on with this pedal?
 
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