Copped the Roland Rubix 44 a few months ago. There wasn’t much literature out there on whether the rubix series of interfaces play nice with Linux / Jack / Ardour so I thought I’d chime in here.
It works great! Not a single problem so far, and a huge improvement over using my Novation X-Station synth as an interface (which also worked but was subject to little artifacts and a whimpy headphone amp).
At 192khz sample rate, I can get 1.3 ms latency. Virtually noise free. Highly recommended. Only regret is that the 44 is a bit overkill compared to the 22 or the 24.
Good question! Roland does not seem to disclose the exact parameters of the compressors in the manual but there are two settings, one with faster attack/release than the other.
I haven’t really had a chance to seriously test the compressors, nor do I have the expertise to judge how good they are. They seem good, though? They’re probably good. I don’t have a mic or guitar to plug in yet; just some synths which do not have the unpredictable dynamic range that would benefit from these features.