As an very early owner of the D-Premier I can definitely say it did not have tone control

Tone control came later on as was part of the software changes, this was something I mentioned in the early days directly to Devialet as feedback that as a customer I would like, along with more digital filter options (this they explained was very unlikely).
I still think it is a mistake not providing more filter options, only needs a couple more IMO and would help with CD quality music where filters have the greatest impact.
Cheers
Orb