I've been fiddling with my Mesa Boogie for a year ....
I'm going back many years when one of the first Mesa Boogie's came into the country but I traveled to Wishers in Derby with my mate who had £1600 in cash to buy it. He spent 2 hours trying to get a decent sound out of it but failed. We went into another room and he plugged a guitar into a 30 watt valve Marshall, got the sound immediately and left with that
I must admit this Roland GR55 I have is the best toy I've ever bought in 47 years of gigging. I go to rehearsals, think of a sound I need and come home and make it. eg I wanted a 12 string acoustic with a sitar behind it for Across The Universe by The Beatles - it sounds awesome but playing live with the band will see if it's any good. I also needed a SRV tone for Bowie's Let's Dance guitar solo and I think I've nailed it.
My guitarist has just bought an Electro Harmonix C9 pedal which emulates organ tones. We now have 3 of us in the band that can play organ sounds.
It came in useful for one song where we both played strat tones with me chugging and him strumming while the keyboard player switches from organ to piano and back again. He went onto his Hammond tone, the keyboard player stayed on piano and I chug and strum which has now improved the song 100%.