Is a pre/pro considered digtal or analog ?

I'd consider it "digital" or purposes of dedicated circuit, power conditioning, and aftermarket power cord selection. That is unless you can shut off the digital circuitry, and prefer to use it that way for serious listening. Else the digital sections may throw "pollution" (RFI, EMI ??) back out to your AC mains. This is only really important for serious listening.

A very good question and one I have sonically experimented with as I have two pieces of equipment , A Classe SSP-60 which internally has seperate power supplies for digital and analog, and a Sim Audio Eclipse which has an external PSX Power supply where if you read the information it says in the power supply chasis it has both analog and digital circuts , Yikes ! The best Sonic results I have found are to give it its own circut . Whether it be a dedicated line, or If you have a quality PLC that has a isolated circut all its own.

Saki70,

A component is "digital" or "analog" depending upon what type
of signals it handles.

A run of the mill "preamp" with analog signal in, and analog
signal out is definitely "analog".

A DAC with digial in and analog out - is "digital"

A pre/pro has components and functions of both - it has a DAC
so it is "digital", but it also may take in an analog
signal and output analog - which would make it "analog".

However, "digital" and "analog" are just labels - who cares
if a component is "digital" or "analog"?

A "DAC" is a "DAC", a "preamp" is a "preamp" - I think we
all understand what each does - so there's no real utility
in labeling them as "digital" or "analog".

Dr. Gregory Greenman

Also note a Horse is a Horse of course of course unless of course , that Horse of course, is the famours Mr. Ed.

Wilbur says keep digital on seperate lines from power amps.

I agree with the above. I have a B&K Reference 20 preamp/processor that can handle digital or analog inputs and outputs. I used an optical digital cable from my CD digital out to the digital input on the preamp. So the digital signal from the CD does not get converted to analog at this point, it feeds the digital directly to the preamp as 1s and 0s.
But the preamp then needs to convert the digital signal to analog before sending the signal to the power amp. From this point on the signal's analog. Strangley, the sound is much better using the analog outputs from my CD to the analog inputs on the preamp. The difference is not subtle, analog sounds much more real and dimensional. I'm not sure why this is but I'm curious.