I have a Spider IV 30 watt. I'm unsure how to save a tone I customized. It think I've saved it to channel A. But I now want to put that tone on B, and then put another custom tone to A, so I can switch with foot controller from A to B. When I press B to save the tone, the amp changes to the factory preset that's on B. I've seen instructions for restoring the factory presets, but little on saving your own. I recall seeing instructions to hold one of the buttons down for 2 seconds to save to that channel. Is that right?