Rocktron HUSH Systems The Pedal with Dual Thresholds. So I just opened a couple of old equipment trunks before I moved them to long-term storage and found a few items. This is a real problem solver for those with noisy rigs. Having two, footswitchable, thresholds is awesome for switching between single coil and humbuckers or clean and and overdrive amp channels, etc. I've tested it. I'll clean it up a little since it's been sitting in a flight trunk for a couple of decades.