Build Your Own Clone Message Board

I've built a EP booster and put in a voltage display instead of a regular l.e.d.
bypass works fine. when pedal engaged the boost effect is very quiet and it hums fairly load and changes frequencies with the display. here is a 10 second video of what I mean. I using another display outside the box to eliminate any emr https://youtu.be/bptsmJtSfWc
take the display out of the circuit and the pedal works perfectly
Any ideas?
tia

tried to upload a pic but it seems byoc has reached its upload limit so here is a link to a pic
https://postimg.org/image/c7abe0rt1/

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Doh! Stupid Diode

The individual segments of the LED display don’t just turn on and stay on. They cycle ON & OFF very rapidly in sequence. This switching ON & OFF is likely the cause of the noise you’re hearing. Solution? Lose the display.

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"It’s your soldering."