Guitar pedal popping sound

This is normal. The reason this happens is because the capacitors in the circuit leak a little bit of DC while the pedal is in the bypassed state. When you engage the pedal, the capacitors charge back up to the proper operating voltage which is translated into a small “pop” in the audio signal.

1. How do I get rid of true bypass pop?
2. Do all true bypass pedals pop?
3. Why is my pedal hissing?

How do I get rid of true bypass pop?

Build up of DC leakage from the input and output caps in the true-bypass pedal. Sometimes stepping on the pedal a few times will release that build up and the pedal will stop popping.

Do all true bypass pedals pop?

A: All pedals with true bypass are prone to pop a little when the switch is clicked on, but most are designed to pop the minimum amount possible.

Why is my pedal hissing?

But if you hear a hissing sound when pushing down or letting up on the brake pedal, it usually is caused by the brake booster leaking air, which could mean there's a leak in the booster diaphragm, master cylinder gasket, or vacuum hose. The brake booster relies on vacuum pressure to do its job.