Problems with Pork Barrel

[nativetrash]

I'll post photos of the wiring & board tonight in case the answer isn't obvious but I just built a pork barrel and have successfully made 10-12 pedals prior to this one and when I went to test it out it made a weird pulsing / almost heartbeat noise but nothing else. It bypassed fine but when on it kept making the noise.

Anyone have any idea what might be going on?

Edit: this is the MN3007 version

[Scruffie]

Voltages are needed.

[djaaz]

it made a weird pulsing / almost heartbeat noise but nothing else.

Sounds like DC noise, check for wiring?