Clutch71 is right, I also own the stiletto deuce and a month ago I was looking around for a new delay and chorus. Believe it or not I wound up buying both the echo tap and dls chorus vibe. I wound up returning both of them. The effects themselves sounded fine but neither worked well in my loop. I cant say that I noticed any tone suck but for some reason both of them added some breakup to my sound. If playing on the clean channel my sound would breakup a bit, kind of like adding just a bit of gain to my signal. I found if I lowered the effects loop knob on the rear of the unit, it wouldnt be so bad, but that defeated the purpose because you could hardly hear the effect.
I wound up buying a few more analog chorus and delay effects and everyone of them did basically the same thing. Im not sure if the analog effects circuitry cant handle the effects loop or vice-versa.
The only thing I can suggest but Im not sure at all if it will work is possibly try putting a lower gain tube in the effects loop tube socket v4. This may work but I dont know, so consult mesa on this one.
To finish this up, I wound up ditching the idea of analog effects in my loop and eventually again, believe it or not, I wound up giving the analogman high cut mod dd-6 a try and couldnt be happier. My quest for a delay is over,, its almost like it was made for my deuce. Awsome.
I wound up with a regular old boss chorus because I dont use chorus all that much and it sounds nice and clear on my rig.
P.S. ive tried many other solid state delays and chorus's from different manufacturers and all of them worked fine in the loop of my deuce.
My problems only started when I decided to try analog in my loop.