So I've built a Wavelord is completely functional with working LED's, but it emits a loud hum when engaged, and a slightly quieter hum when bypassed.
Link to photo Album: https://imgur.com/a/5Al3fFi
I used an NSL-32 (https://www.alliedelec.com/product/luna-optoelectronics/nsl-32/70136794/), and a 2n5457 for Q1.
Here's a sound clip: https://voca.ro/9ZyKQLSF7lh (https://voca.ro/9ZyKQLSF7lh)
Anyone else having a similar issue? I can do some voltage readings for stuff if you all need more information.