Hey guys,
Omnisphere works exceptionally well with all of the ROLI Seaboard products, including the RISE. Any multi-timbral soft synth will work, but I think Omnisphere is the most useful, aside from Equator, which is the ROLI synth.
Dan is correct in that there is a "Dashboard" that you run when you hook the instrument up. Within the ROLI Dashboard, you would choose for the instrument to function as a "multi-channel" controller and specify that range of channels. In the case of Omnisphere, you would choose for it to run on channels 1-8 since that is the maximum that Omnisphere can run simultaneously. For other synths (like Kontakt or Synth Squad), you could use more. If you aren't in multi-channel mode, you can't bend a note in one hand without it effecting whatever you're doing in the other, just like a pitch wheel on a regular controller. There is also a single-channel mode, which is actually the best thing to use when selecting your sound on Omnisphere. Otherwise, if you are running on multiple channels, only one out of every few notes will actually sound since by default, Omnisphere is only running on a single channel and only when that one channel lines up will you get response. So even though you won't get the full effect of polyphonic pitch bend, it helps you select.
Once you've chosen your patch within Omnisphere, you would need to do two things to get it to work properly with the Seaboard. First, you need to change the pitch bend range to +/- 12 semitones. That's how the instrument functions properly with all of the bending and glissandi. Once you've done that, click on "Clone all parts" and it will then copy that one channel to the remaining 7. Then you would switch back to Multi-Channel mode within the Dashboard and you're good to go.
Now, Omnisphere has a great edit mode and one of the big draws of the Seaboard in my opinion, is the natural approach to poly aftertouch. Within the edit mode, assigning Aftertouch as your source to various targets (volume, open/close filter, LFO speed, etc.) works fantastically well. Depending on your DAW and your CPU capabilities (keep in mind, running all of this stuff on 8+ channels simultaneously can be a CPU drain), you can load multiple instances of Omnisphere and add atmospheres or textures that only trigger with heavy aftertouch. Really cool stuff! Just don't forget to clone the parts if you make any changes because within Omnisphere, you are only editing one channel at a time until you clone it.
Hope this helps! Feel free to get in touch if you have other questions!
Neil