Sorry to hijack the thread, but I'm having the same problem and I find that the gap when changing patches and amps is nowhere near "tolerable". Is there anything that can be done to avoid or at least reduce this problem? I'm using the HD500X, updated to the latest firmware (1.20), but had the same problem before upgrading firmware as well. Here are some examples I recorded, USB _not_ plugged in, recorded directly from 1/4" output into a separate audio interface. Changing between two copies of the same patch (looking at the waveform the gaps are roughly 40 ms): http://www.emancer.net/hd500x/hd500x-switching-tones.mp3 Changing between two amps in parallell in the same patch (the gaps are roughly 80 ms with a nasty crack/pop): http://www.emancer.net/hd500x/hd500x-switching-amps.mp3 Right now I'm reduced to using the same patch for entire songs using the stomps to change the sound, like adding a delay or putting a volume pedal in front of the amp to switch between a crunch tone and a hi-gain tone, but this really is a poor solution and doesn't give me much flexibility.