I may have spoke too soon: http://www.sega-16.com/forum/showth...ystem-Mega-Drive-Sega-Saturn-(Crystal-Switch) In my case (I have an NTSC MD with 50/60Hz switch) I always set my XRGBMini Sync Mode to Off (not Auto) that is to say to create a correctly timed HDMI signal even if that means stutter .... that is because small deviations from HDMI timing make my TVs (plural) show nothing at all. Sync Mode set to Auto in the XRGB tends to "duplicate" the same input frequency at the HDMI output (within limits) usually generating non std HDMI signals, some video equipment can latch on but many TVs do not as the HDMI std is pretty prescriptive. So the extra stutter on the NTSC MD at 50Hz (due to the 50/60Hz switch) may not be noticeable to me anyway. I believe the Saturn could be in the same boat .... if you leave the XRGBMini to SyncMode = Auto it may give you trouble as the HDMI frequency will be "wrong", if you set it to Off it will stutter usually in case of 50/60hz mismatch (when the game is 50 but the HDMI out is 60 or viceversa ..... ). So told it may skip also on 60 to 60 or 50 to 50 if the originating 50/60 is not that close to what it expects (NeoGeo MVS for example generates its 60Hz at really 59.18 or alike which gives raise to trouble). The XRGB will "sync" fine but your TV will have issues syncing when Sync Mode is set to Auto or you'll have stutter in Sync Mode set to Off unless you have a lucky TV that is fine with same deviation from the HDMI timing (thus allowing Auto). Sorry for the confusion, it's been such a long time that I set the Sync Mode Off and accept that modern TV are "fixed" at either 50Hz or 60Hz (as per HDMI timing) that I accept the small stutter as part of the deal!!!
A PAL Megadrive at 60hz will generate a bogus signal too far away from the spec for the xrgb to work with it in some cases (many digital TVs also behave bad with it, and require either a c-sync mod or give you an off-centered image, etc). But I don't remember anyone ever having problems with a PAL Saturn at 60hz. It generates clocks almost exactly identical to a machine with an actual NTSC clock.
Forgot to mention that I also have a sync stripper (LM1881) on the sync signal (in the Scart adapter) and it is almost always on. I remember I had to do it because some console/games combination needed weird values of XRGB Mini Sync level but with a sync stripper it all was much better (in specific an SMS with outrun needed something like 12.5 which you can't really set, also my AES with one particular game [can't remember, a shooter] was a lot of trouble). To be fair most of those old consoles without a special Scart cable used composite as sync (some used a luma like signal which is a little better but still) hence a nice clean-up via a sync stripper is almost due, I know of the CSync/boosted-CSync cables but I preferred the LM1881 solution (as I did it once on the adapter Scart to JP21 and I'm done for all consoles).
I do have some more saturns im trying to get rid of. Give me a day or 2 and ill update this post but PM me in the meantime if you still have any interest