Sound improved (the main site sez its at 100%). Changelog is full with technical stuff related to that which I can't quite make out. It also mentions some kind of virtual Backup Library that makes save carts obselete as it grants you infinite backup ram space and saves game stuff on your hdd (in the Backup folder), but it may introduce bugs.

Shima also mentioned in the forum that the majority of bugs of the older version came from the sound emulation, which got a complete rewrite this time.