This is by far the finest sound ever heard through a keyboard amp (by me). Im playing a Nord Stage Classic through it. My gig board is a Nord Stage 3. Cant wait to hear that through it. Acoustic piano just sparkles and electric pianos are deep and fat as is organ. My previous amp was a MS KP-500SN and even though its advertised as the same wattage (250/channel) the 612 pushes a ton more volume! I love the 500, but this is in a different league! The only issue Ive had is that when I turn up the stereo expand, it started to buzz (used for organ). I think Ive found a solution, to turn up output on Nord and down on the organ channel. Never encountered that on the 500. I think this is the answer for those, like me, whod rather not bring a pair of powered speakers to every gig. Pricey at 1499 as well, but I think will do wonders for my tone and cut.