Improvements?
Well, for one, you should get much better channel balance and tracking, and if you get the custom attenuator you can choose the resistor type and can opt for lower noise, more transparent resistors, and beyond that the hard gold contacts should, in theory, make a cleaner connection than a wiper against a resistive film.
The thin film resistors, I believe are made from a nickel-chromium resistive element -- neither of which is what I'd personally call idea for audio use, but on the other hand the thermal noise coefficient is pretty low for these.
When I do this again I'll most likely buy the mini-v and buy my own vishay CMF-55 series resistors -- they are low temp coefficient, high precision (.1%) and sound pretty neutral to me. Or I may just go with the Kozmo discrete vishay type. That's a a way off at this pint yet. At this point I myself am still inclined to use a PEC pot.
HTH,
Jim
Jim Rebman -- recovering audiophile
Equitech balanced power; uRendu, USB processor -> Musette DAC -> 5670 tube buffer -> Finale Audio F138 FFX -> Cain and Cain Abbys near-field).
s.e.x. 2.1 under construction. Want list: Stereomour II
All ICs homemade (speaker and power next)