Well let me give you the skinny on the MO8. First let me say you're comparing a "stage piano" to a "workstation". The Roland RD is a stage piano (killer action too!) The MO8 is an 88 key workstation.
The MO8.. Sounds on it are pretty darn good. Same soundset as the ES series. The MO will give you a nice set of pianos, EP's, Brass, good guitars and basses, some decent synth sounds, and KILLER orchestral sounds. Drums aren't too bad either. The action is "balanced" and NOT "graded" hammer. Id compare the action closer to that of the Yamaha S-08 model. There is also no aftertouch either.
The MO series are "closed systems". Literally "what you see is what you freakin get". NO EXPANSION! No sampling, meaning no loading of new raw voice data or audio loops ect. It has a full synth engine though. Pretty darn good one too. If I remember correctly is runs 3 insert effects (that's a plus!) especially considering some units out there still run with only 1 insert. Overall construction quality wasnt too bad either.
Now the MAJOR downside. Only 64 note poly! Imagine going to a car lot and seeing a nice Ford Mustang. It's all decked out with ground effects, scoop on the hood, and from the outside is looks like it would eat you alive. You'd expect to find a 5.0L under the hood, but when you open it you see a freakin 4 cylinder
That's what the Poly is with the MO. It's got the sporty car looks, cup holder, dice hangin from the mirror, but rather than running on 128 balls with dual exhausts(like it should) it's choking on 64.
Poly is the reason I sold the bloody thing. Blowing the poly was so easy on the MO series. Once you start using the arps, sustaining sounds, ect. the poly drops fast. Sure there are work-a-rounds, but they are serious "voice compromising" work-a-rounds. For example: going into a particular voice you're using and "turning off" elements to reduce poly blow outs.
If you're heavy into orchestrating songs you're going to run into poly issues. If you want good sounds, good real time control, decent key action, and sequencing isn't on the top of your list, then the MO will work nicely. The MO8 is still the best 88 key workstatin out there too. The only other 88 key workstation that's in the same price range is the Fusion 8HD, and don't get me started on the Fusion's either. I owned the 6HD..., what a waste of money!
Squeak
[This message has been edited by squeak_D (edited 03-30-2007).]