To my ears, Mscaler, and with Chord DAC's in general they really depend on the source being bitperfect and not overly DSP'ed in a studio. One DSP setting activated on your player can take 80% away of Mscaler's effect.
A few settings to check on you player:
- Output samplerate is the same as the record's one
- No EQ enabled
- No room enhancement used
- No upsampling used in player
- No player volume used (set on max in the software) use only the DAC's one
- Balance is at zero shift
- Max bit depth set not lower than 16b
- No Dither enabled
- Uncheck any other 'enhancement' setting, keep it stock (flat)
- If using windows use Wasapi
- Not playing a remaster, try using older originals, often 44.1 sounds better than higher like 96/192k
- Use no MQA
I find that with electronicly generated EDM music the Mscaler dont add much as theres less natural instrument transients to recover like with simple mike recorded sources. Try to find once a genuine pre 1968 recorded track from non remastered 44.1 redbook.
Lastly dont A-B with and without Mscaling too quickly, listen for a while and let your brain adjust, then switch over and listen for a time without touching anything.
Hope this helps