I'd love to test out this cartridge.
In response to your questions:
= I have an NTSC SNES.
= As for DSP cartridges, I have DSP-1, DSP-2, DSP-4. (I don't remember which versions of DSP-1, I'd have to check again. I think I have all of DSP-1, DSP-1a, DSP-1b though.)
= I of course can code for the SNES (I've even reverse-engineered some of the stuff that has gone into emulators).
= I'm not a web master of major sites, but have worked with many SNES homebrew/emulator/gurus and would be able to post a review at Nesdev or Zsnes forums that would attract some attention and start more discussion.
The reason it will attract attention is that people know I am obsessed with SNES hardware, and I will thoroughly test out its base capabilities so that everyone knows what it is _capable_ of (so even some currently unused awesome capabilities will be mentioned for homebrew enthusiasts)
I'm also curious to see if you implemented my /RESET suggestions to support the SPC-Player your group was working on for awhile. Currently no product has hardware+code to do this, so you'd be a first.
As an aside, the IC decapping/reverse engineering I did for the CIC chips has been almost completely finished by a smart fellow named segher. Just like the community eventually made a simple NES CIC clone, we are very close to a SNES CIC clone. Would you be interested in, and able to use, this info when the CIC project is finished?