Shadowwalker δεν οφείλεται σίγουρα σε αυτό που λες...
Δεν είμαι ειδικός, αλλά για δες τι λέει εδώ:
http://www.geofex.com/Article_Folders/bypass/bypass.htm
Παράθεση: A word about pops and clicks - almost all effects are powered by a single 9V battery, and this means that for DC biasing reasons they have both an input and an output DC blocking capacitor to carry the signal into and out of the circuit. No capacitor is perfect, and whenever the outermost end of either capacitor is open-circuited by a hard (mechanical) bypass switch, the leakage will allow some of the voltage to bleed into the outer terminal. When the capacitor is again connected, it no longer perfectly matches the average ground level of the signal, and this voltage is coupled into the signal path as a pop, the loudness of which depends on the size of the capacitor and the amount of the voltage change. The cure is simple - put another resistor on the outermost lead of the cap to pull it to ground permanently, even when the bypass switch is open. Leakage current from the capacitor is conducted to ground by the pull-down resistors and so no DC-offset pop can occur. For the purposes of curing leakage-clicks, the resistors can be quite large, from 1M to many megohms.
κι εδώ:
http://www.tech21nyc.com/tech_notes/tech_truebypass.html για το true bypass.
κι εδώ:
http://archive.ampage.org/threads/0/fxgen/001651/Re_Anti-pop_resistors_for_true-bypass-1.html