Funny, I find the 800 easiest to use vs anything else. I've had the Yammy too, but the ease of creating, saving, quick changing and overall sound quality is unsurpassed. As Lee said, send all to the Songbook and fly fast in live play (at least I can do it)
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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand

Studio: Korg PA4X/Yamaha DGX670/Nord 6D73/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/ATEM Mini Pro switcher/K&M stand