Jerrytarolli

I would imagine this has been covered before and I've tried everything I could find. I'm new to midi switching, so I guess I don't get it? I've used the Helix LT to switch my amp channels in past with no issues.....but now I have an EVH EL34 head that I would like to switch with the Helix and can't figure it out. Does anyone out there know the exact steps to do this with an EVH head? Any help would be greatly apperciated!! Thank you!