Yeah on my power supply the delta's pretty fine as is - this is definitely in the 'want' category rather than 'need'...
I was inspired by all the talk of modding, as usual, and often folks are chucking in different opamps (not just with this desk, all over the place) but then I saw this thread by 'Kingston' in Helsinki on groupdiy - where he achieves amazing results (on some studiomaster desk I think) just by properly getting to grips with how opamp decoupling/bypassing actually works.. when he had that sorted (and it's a pretty long thread as he/we learns just what the hell is going on there) it made sweet FA difference what opamps he dropped in, so he concluded that the different 'sounds' of opamps are basically the different ways they're playing fast and loose in the usual not-very-optimal setup... get the setup right and they all do their job just about excellently.
Now the decoupling approach in the delta is pretty agricultural, so I surmise that there are some pretty easy gains to be made there with careful investigation. Actually "Living sounds" is on that thread near the end - I he/she is a Delta user too (or maybe 200b).
I've been fascinated by how to set up the environment for opamps, and how some of the fancy pants new ones are proper primadonnas, and how many folks suggest we don't need them at all for audio work.. basically I'm just intrigued, so my motivation is both noise/distortion reduction and basic curiosity, the delta's a good testing ground I think. I'm going to keep my experimentings to the channel module to start with so I can easily compare modded/unmodded, and test through the various routes in and out of the module.
Once I have some confidence I'll then go over the group/master sections in the same way.
if you google "group diy decoupling kingston" you should see a thread called "opamps and local decoupling of rails, some questions"
And as for shoehorning the filters in there... well I just want nice filters. it's the unbalanced middle section of this schematic: http://strangeweatherbrooklyn.com/sa...fordfilter.jpg
the middle opamp of which is laid out fairly similarly to the high-pass opamp on the delta, the other two are very simple themselves, I might even wire it up dead-bug-style..
then yeah, finally I'm intrigued about getting some low-dc chips in and removing lots of caps from the signal path.. that's gotta sound good too, right.. but I intend for this to be a fairly controlled set of experiments, so one thing at a time...