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UTILIZATION

I think it's the easiest roland groovebox. The manual is a bible
I have not had much difficulty to take charge
the only downside sampler (I used the SP808) is chiantissime to use, but it is super complete headlock at will ...
I kept my SP808 and zip which is much easier and has a crazy MFX (much more configurable than the 909)
a super midi sequencer to control other boxes ... (I drive a dark energy and with a Microkorg)
a screen that makes your life easier as not allowed ...

SOUNDS

The kits are excellent batteries
there are good surprises (the sax and brass do not sound bad, some guitars are interesting for more electro it's pretty cool)
The multiband mastering compressor is a killer ...
Filters sound like roland filters ...

OVERALL OPINION

I love it despite its flaws (sampler and MFX).
A second would be welcome but must be reasonable ...