Hi,
The XP-30 is using the original Super-JV XP-chip Engine at 32k.
The XV-3080 is using the upgraded XP6 Engine at 32k. The XP6 includes (as mentioned) stereo waveforms abilities, but also includes Matrix Mod, new MFX, and 24-bit DACs.
I recommend looking into one of the XV-5080 Engine units, which are 44.1k and IMHO much better.
This includes the XV-2020, XV-5050, XV-5080, Fantom, and Fantom-S models.
David
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Li'l Chips Systems
www.lilchips.com