It's actually described underneath the options--and they do make a difference if not a LOT in some cases.
- DC Phase Linearizer: "makes the low-frequency phase characteristics of the player closer to a traditional analog amplifier" (to my ears: a rounder, less analytic sound);
- Vinyl Processor: "recreate the warm, rich playback of a record on a turntable" (to my ears: a bassier, warmer, less analytical sound).
Overall, to my ears, both options open-up things and add a little omph.
On Beryllium DDs (CA Cascade, Dunu Titan 6) I have them off.
On my BAs (CA Comet) I have them on.
That sounds like exactly what I want from listening to music! Thanks, I'll try it out on all 3 IEMs soon.