The ebay seller made good, sent me the adapter, though it works intermittently (something in the adapter is loose?), the pedal does work (not with batteries though). I plan to send him some cash for it just cause these aren't cheap, and it works.
My set-up BC Rich American Custom Spider (aka Widow) 4 string bass, active EMG PJ pickups (old strings that should be replaced)
set-up #1 --> Trace Elliot SMX Dual Compressor --> Bose L1 / T1
Overall, the pedals effect was very subtle, I had to crank the compressor levels past 3 o'clock to really get a noticeable impact. The EG knob was very effective, full counterclockwise is was very muffled rumble, like some early/mid '60s bass tones; all the way clockwise it was like a Ric 4001 on the treble pickup, I ended up around 10-11 o'clock. The High Compression gave a nice sparkle, and some metallic bite (the bass has this naturally, but it sounded much better, more musical). The Low Compressor really gave a bite and and edge to the sound, evened it out and gave it that Trace Elliot spatial dimension.
set-up #2 ---> Trace Elliot MP11 preamp --> Trace Elliot SMX Dual Compressor in effects loop --> Bose L1 / T1
Wow! It was like taking a blanket off the thing, it punched! It had the similar effect, but much more noticeable, crisper and cleaner at lower compression levels. I was able to get great low compression that enhanced the tone with a rich TE sparkle and definition, if I got on the bass it would growl but in a more manageable and musical way. I had the low compression level set between 1-2 o'clock The high compression sounded really good too, I left it in set at about 11 o'clock and it really balanced the tone, giving the high end more balance / evenness with the lower frequencies. The overall smoothness was enhanced too. I ended up with the EQ knob set at 1 o'clock.
In both cases, especially #2, I noticed better sustain as well.
It's really difficult to describe the effect, it doesn't squeeze the life out of the tone like most compressors do, it is definitely enhancing (enhancer / exciter maybe?) without changing the tone, it made it just come alive, richer, fuller, more musical and what I call the "TE spatial dimension expansion", that seems to be unique to the older TE amps. YMMV, but if you want this bass-musical-spatial enhancement this is the way to go. It really sounded better in combination with / in the effects loop of my Trace Elliot MP11 preamp. I didn't try it in front of the MP11 though, and I used a different setting in the Bose system, so the two scenarios are different. I really expected the bass direct into the compressor pedal would have had greater effect, but the opposite was true. FWIW, this compressor circuit is the same as the one in the GP12SMX preamps / amps and in those amps the compressor is after the EQ section, the last stage out of the preamp. By placing the pedal in the MP11's effect loop it is in the same place in the signal chain as it would be if it was built-in to the preamp.
For me, this is what I wanted. It gave my MP11 more Trace Elliot mojo (that spatial dimension expansion thing) that it was lacking compared to
the GP12SMX I had. It is staying in my rack, in the effects loop. Now I need to figure out how I can mount it in the rack for travel and for use. Right now its sitting on top of the rack case. I can see using this on or off per song so it doesn't need to be on the floor, but I need to spend more time with it.
I don't have a way to make clips with my set-up, as I'm still building
my guitar rig (bass rig is set now!) out with GAS, and haven't started on recording aspects yet.
I think this is a very musical, subtle and effective compressor that provides tone enhancement and balance without squeezing the life out of your sound, in fact it really doesn't seem like a compressor, more like a compressor/exciter?
What I don't know is how well this will work non-Trace Elliot gear? Well worth the try IMO
Hope this helps.
Here is a link to the manual I found, which will provide better info than I can:
http://www.britishaudioservice.com/inst/SMXPED.PDF
They have all been great amps.
Every time I assume somthing here, I'm wrong 
