You should be able to but I would recommend that you email Scott Splawn and ask if the amp is compatible as per the FX8 Manual. I have an older Splawn Competition and asked him and received a prompt reply. In my case it was fine and the channel switching works great and is easy to set up. Splawn should also have resources available that will tell you the correlation between the amp function and the Tip or Ring for the footswitch.
"IMPORTANT! The relays of the FX8 are designed for use ONLY with amplifiers that use “short-to-sleeve” type switching. Do NOT connect the FX8 relays to the switch jacks of an amp that uses voltage differential switching or any other type of switching aside from short-to-sleeve, or serious damage can occur to both units. If you are not 100% sure, contact your amp manufacturer to determine whether your amp is compatible with short-to-sleeve switching. The FX8 relay jacks are compatible with TRS cables, TS cables, or TRS-to-dual-TS split cables. The relays are also fully isolated from the electrical ground of the FX8.
This warning is stern, because the last thing we want is for anyone to damage their amp or FX8. In fact, short-to-sleeve relay switched amps are quite common, and your amp may be perfectly compatible. We need to require you however, to understand how your amp works and make the right choices about connecting it to the FX8 relay jacks.
Your amp manufacturer should be able to help."
