Sounds like your pedal is busted.

The Memory Boy does not have any trim pots inside to adjust modulation. All the adjustments are brought out to the surface of the unit.

For both units we have been making improvements in their calibration. We found early on that we tended to calibrate them too lean, meaning the signal out of the BBD chips was too quiet which results in quiet delay in some units and unable to runaway when Feedback is maxed.

A volume pedal is a bit different from an expression pedal. Expression pedals have a TRS connector with all three terminals of the pot connected to the three terminals on the TRS connector. T = Pot Wiper, R = Toe Down Pot connection, S = Toe Up Pot connection. A volume pedal only has a TS connector, where T = Wiper and S = Toe Up Pot Connection (or ground). The input to the volume pedal is connected to the Toe Down Pot connection.

For the expression pedal input on the majority of EHX pedals, a volume pedal will not work as well as an actual expression pedal. So I recommend you get an actual expression pedal to connect to the expression pedal inputs of EHX pedals.

I believe the Boss FV50H is just a volume pedal and not an expression pedal though I could be wrong about that. If you want a very durable expression pedal (many are not that durable) try the Boss FV-500L. The FV-500H will probably also work fine but the lower impedance of the 500L is better suited for the Holy Stain and most other EHX expression pedal inputs.

In analog delays, it is normal for the hiss and noise to increase as the delay time increases. Most analog delays exhibit this characteristic.

I believe the compressor is making its own popping sound which is then going into the delay loop of the Memory Boy. So the compressor is really its own problem. Knowing this it doesn’t change that I think a capacitor on the Memory Boy needs replacing.

Does the Memory Boy pop when BLEND is set to 100% dry?

Also I should mention it is normal for the Memory Boy to pop when going in/out of effect mode for the first 30 seconds or so after power up. While all the voltages get settled.

There’s a mode in the V-256 called INSTRUMENT CTRL which is not really mentioned in the video. It is a wonderul effect that allows you to set the pitch of your vocals (no matter what pitch you sing) with a monophonic instrument. It works really well with guitar but it won’t track chords.

The way it works is you play a note on your guitar, say an E at the 5th fret on the B string. Then sing into the mic, the output of the effect will be your voice pich shifted either up or down to the same E note you played on the guitar.

Think of it as Auto-Tune that let’s you play the notes in real-time. It’s great as a new kind of talk box effect or new style of vocoding. I see a lot of possibilities for live use, mixing the guitar and vocal together where the vocal tracks the guitar.