You can easily achieve dsf to flac conversion with the ds2flac utility, which allows users to quickly and simply convert various DSF digital audio files (Delusion/XTracker etc.) to a FLAC format. Except for that, you might have luck with some professional, mainly commercial, audio editing tool, such as KORG AudioGate.
Open DSF file Open FLAC fileA simple DSF to FLAC conversion utility
An audio player and converter