Can I use Pamela’s PRO Workout to quantize an external signal?

Yes -  with the external signal patched into CV1 or 2, set your output channel ‘level’ to 0%. Assign ‘offset’ to the corresponding CV input and then set the ‘Quant’ option to required scale. Pamela’s PRO Workout will behave like a traditional quantiser with the CV input voltage quantised. Note however there may be a little lag and limited resolution (12 bits) compared to a dedicated quantiser.