the simple and straight forward answer is
I dont, whilst I am amp switching generally thats only the pre-amp part. I do run multiple poweramps in some situations but they are all doing slightly different things and are all coupled to their own speakers when used.
to switch cabs between poweramps is also slightly tricky as you ideally need to maintain the speaker load on each amp.
Have a look a something like radial engineerings Headbone, which should give you what you need for cab switching between 2 amps
http://www.tonebone.com/tb-headbone-vt.htm
I dont, whilst I am amp switching generally thats only the pre-amp part. I do run multiple poweramps in some situations but they are all doing slightly different things and are all coupled to their own speakers when used.
to switch cabs between poweramps is also slightly tricky as you ideally need to maintain the speaker load on each amp.
Have a look a something like radial engineerings Headbone, which should give you what you need for cab switching between 2 amps
http://www.tonebone.com/tb-headbone-vt.htm