i have the user manual in front of me. this is covered on page 9. "if you find that the digital output is lower than desirable when compression is engaged, try summing the identical left and right digital outputs together. You'll get 6dB more overall level and 3dB greater signal-to-noise ratio."
this is due to the lack of make up gain on the compressor.
also, when using the analog outs, you should use the balanced outputs as they give you 6dB more level than using the unbalanced outputs.
i'd agree with this statement--driving this preamp is one of the things that gives it a nice character. however, as noted on page 11 of the manual, "the 20dB pad only affects the analog output circuitry. Engaging the pad has no affect on the signal at the digital outputs".
this means that you can't use the pad on the digital outs, and therefore lose the ability to "soft-clip" the Tampa via engaging the pad and driving the input (one of the "cool features" they hype about it).
IMO, that makes the digital output a bit less functional than desired. i use the balanced analog outputs going into my Delta 1010 and it sounds plenty fine.
cheers,
wade