Esoteric K01: What are the best settings for CD?

Jon2020 has reported significantly enhanced DAC performance on K-01 by installing the new USB drivers... Suspects that fixpack might include updated DAC firmware. See:
http://forum.audiogon.com/cgi-bin/fr.pl?ddgtl&1412493000&openusid&zzGuidocorona&4&&

After using my K-01 for a year now. I found the best setting for most music is no up sampling (org). With filter set to Sdyl-2. Sound has so much depth, tone, color, transparent with 3D presence. I was rather shocked at the improvement. I never liked this setting when new, funny my Dealer told me back then this was the best and it was how he showed the unit. Of course room and speakers can have a huge impact, but now my K-01 is in a league of its own in any format. 

I've finally settled on 2X upsampling and FIR 2 filter for the mostly acoustic jazz and classical I listen to on redbook CDs.  Greater upsampling results in a blingy, too forward piano, and SDLY filters seem to add a veil similar to what Dolby did on my cassette deck in the 70s.

You have to let each filter burn in. When I would a/b a setting against the FIR and Org. Setting and i did not like it, like you say a film and bloated. I went to SDYL-2 with Org. As my dealer strongly suggested when I purchased it and gave it a few days and all of a sudden it sounded real good now after a month I cannot go back. Good as any sound system I’ve owned vinyl or digital. Every recordings sounds correct, the artist right in the room 3D. Natural with great color and tone. Does it sound like vinyl, does it sound like stereotypical digital no, it sounds like music and like all forms of reproduction it sounds as good as the recording. My test is to sit in the next room from my system and listen, if I am fooled to thinking I am hearing a session next door, I know it is real good system, only a few times I’ve experienced that in my system or another audiophile system. One was vinyl the other 2 digital CD systems.

I must mention that power cord used will dictate filter setup. I have enjoyed Org with For 1 and then Org and SDYL 2 when I switched power cords. For more natural cords ORG and SDYL 2. For cords that add more weight then I use Org and FIR 2. On those cords SDYL 2 has a slight veil and lacks detail and dynamics. So you have to learn your system and use the setting that brings out the best. Having a good ear helps. Having a vast collection of all formats in my life I know what certain recordings should sound like. Vocals and piano are a big key to me then mids, lower mids and bass for correct foundation, then speed and transparently.