Dikki,
My Kurzweil PC3 has very little issues with any sounds. The K2600X was great too. Yes, a few issus but nothing compared to Korg, Yamahaarrangers (Kurzweil is big on having top quaity sounds, as you know)

I know about the stretching up/down 1-3 notes on samples (multisamples) I have looked at this carefully and it is not always the only issue. I just made my own complete sax from a set of samples for Kurzweil, and I streched up/down 3 each way...no problem with vibrato or tibre at all.
Some of those samples are way off at their recorded note, not just the streched ones. Some sounds do not have the problem and they are also done the exact same way. So why are they not all bad??? Because some are done right.

Some samples are just not right.

I can tell you how the Korg M3 solves it...the samples are not burned into ROM only (loaded to RAM from HD, so Korg or anyone, can replace them if needed.

Sorry to highjack..it's Andrea and Sarah's fault...talking about all that pure quality voicing! got me going!:-)

Lee S.