Really is a wonderful feature this AKAI support the OASYS has. faster loading than the Triton Studio, And a gazzilion times faster than the Yamaha A4000 I used to have (40+ minutes to load 58 megs of brass samples (from CD). I used to cook dinner eat it, wash the pots, and still see the percentage loader on the A4000
Tony
KORG KRONOS 88-Korg D3200-Casio Privia PX-830BP-KAWAI RX-2 Grand Piano
Sequencing: KRONOS/Cubase/Cubasis/iPad air2
Anything between S1000 and S3200 format should work even though KORG say it's S1000 format you should be using. I have a few S3000 libraries and they work fine on the OASYS. I see no difference in them compared to how my real AKAI Sampler loads the same disks.
So I'd say that the formats to avoid are AKAI S5000, S6000, Z4 & Z8 formats. They are a different animal altogether.