I'm running Zebra2 (latest version) on a Mac (OSX 10.7.5) with an Edirol FA-66 interface. I use Renoise, but I've confirmed the following problem in Reaper also.
When I have my FA-66 set to 24bit/44.1kHz or 24bit/48kHz, everything behaves as normal.
When I switch to 24bit/96kHz on the FA-66 interface, all comb filter sources in any patch in Zebra2 seem to bottom out their pitch at F#2. By this I mean that notes are pitched as usual down to F#2, and then anything below this plays at F#2 regardless of the pitch being sent to Zebra. This behaviour also occurs when I have the interface set to 24bit/44.1kHz and render songs in Renoise at 24bit/96kHz.
So basically whenever Zebra is being called upon to output at 96kHz by either the interface or the DAW when rendering, comb sources exhibit this odd behaviour. As mentioned above I tried this also in Reaper and got the same results.
Does anyone have any idea what is going on here? Any help anyone can provide would be greatly appreciated, as I love my Zebra combs and this odd behaviour pains me deep in my soul!
