goirish,
I play polkas all the time.  I do a two piece deal with a guitar player in the Frankenmuth area.  Sorry I haven't been on the board in a few days as it's been a bit busy.  I use a Roland FR 7X V-Accordion and an older Ketron XD-3 arranger.  Tom uses a midi'd Fender Strat with a couple of pedal units.  We both play through the Bose systems.  We do a lot of playing in Frankenmuth at the Bavarian Inn's outdoor venue.  Hotter than the dickens sometimes but always a lot of fun.  We have a pretty good local following and have played most all the festivals here in town. 
Joel