I have an old Fender HOT amp from the 90s and just got a Boss Katana 50 MK-II. I want to ditch the old Fender to save space, but what will I do if my buddy visits from out of state and wants to jam together? The Katana has only one input. Do you think it is a bad idea to play an electric guitar through a Roland keyboard amp? Or, do you have another idea to be able to play two guitars through a Katana?