I'm also courious I have a couple rectifier solo heads can the HD500 change the channel of the rectifiers and if not can the Helix do it? I've always been into pedals and only got into line6 about a month ago but in the last month I bought a SpiderValve HD100, MKII short board and a HD500 with a metal pack. I just started reading about the Helix and its struck my attention but after the $$ I spent last month I'm grinding my just consitering this thing..