I think all we can agree that a grooveboxes first rule is to let it sounds good and let it handle easy. This one breaks this in first place. The MC-307 came after the MC-505 and before the MC-909, so I don't understand how was this? Because the MC-505 has an excellent sound engine with very useful inventions, the MC-909 is one of the groovebox kings. I felt that the 505 and 909 was instruments in the good meaning in every aspects, but the 307 is just a product. It has all the sounds in the ROM which you find in MC-303 and 505 plus some others which will appeared later in the SRX series. The same patches comes from the 505 sounds far better then when it comes from the 307. It's simple I think, the 505 has the good old sound engine from the MC-303 but on steroids, and both are well designed for its class. The MC-307 is something what is an early SRX tone generator, let we say, a prototype. For me, the well-known practices what I used frequently on other ROMplers, just simply not did the magic on the MC-307. It's just the weakness of the sound engine. Another painful thing is the gap when you switch from one pattern to another. This means you really bound to a one-pattern performances, at least if this gear is your primary on the stage. In other hands, it has a good and easy sequencer, 7 part instrument + 1 part rhythm (so forget the manual switch hihats and drums independently) and a master effect switch to immediate arm all the effects. It has 3 state: on, off, and grab. The last one is a special state, you have to hold the switch or the spring push back to off state. I think it's a good idea for a groovebox. It has a backlit LCD and it's good and informative at all. So finally, I tried hard to like this gear, but then I just packed the whole thing and replaced with a Korg EM-1. And I don't regret.