Can I use the BigShot EFX as an amp selector?
Yes! It will work just like other ABY amp selectors. Simply connect the loop outputs to your amp. Just a note of caution—keep in mind that there are no provisions for transformer isolation like inside the Switchbone or BigShot ABY. This means that you can encounter hum and buzz due to ground loops, but this should fare no differently than similar ABY switcher. If you get buzz or hum, try lifting the ground. Check with a technician to make sure your amps are safe and properly grounded.