Sadly Solaris on Xite has polyphony limitations. It does work but it is not optimised for Xite so some of the more complex patches may throw up dsp allocation errors and/or only a low number of voices. I haven't used Solaris on Xite for sometime, and only have Solaris v4.1 license for Xite because John Bowen effectively suggested it was not worth upgrading from v4.1 to v5 for the Xite device as the same issues would exist. I quote from an email from John dated 5th Feb 2010
"There is, however, an issue with the really big synth I made and XITE,
as far as polyphony is concerned, and this will affect the Solaris
plug-in (updated or not) and the Quantum Wave (which you are not using).
It seems there are too many connections internally (which I cannot
reduce or alter, since that's part of the flexible design), and these
connections require some special handling. You can load the Solaris
plug-in several times in XITE, with each instance play 3-4 voices, but a
single loaded synth still is only 3-4 voices. It's very strange to me,
but they explained things a bit, and there's nothing on my end I can do."
I remember feeling a bit put out at the time as I felt the early adopters of XITE had not been told about these potential issues with some devices, and transferring the devices was a pain at the time. Luckily though, sometime later on SC had a sale including the Zarg bundle so I was able to purchase that for one of my 15 DSP PCI cards and once again have Solaris on PCI