Gary @sonnyjr.com recomends Boss RV-5 for his amps, so I bought one and use it for all of my amps: Sonny Jr 4X10, Kendrick Texas Crude, Kalamazoo II and Gibson Falcon. It sounds great with all of the amps and has many settings. In fact, I like it better than the reverb on the Gibson. Less than $100.00 I think.