I wish it was a little easier in the Fundamental UI to precisely set the oscillator frequencies – that seems like it would have been more in the spirit of test equipment hardware! But it’s easy enough to do from within Bitwig. (Perhaps ironically, because they are VST parameters and they display in Hz, it’s easier to set Fundamental’s oscillator frequencies precisely than it is to do the same for Bitwig’s built-in oscillators in Grid…)
Another nice feature would have been the ability to use Harmonic mode to set the frequencies, but then preserve those when switching back to the free tuning mode.
Admittedly, I still haven’t read the manual so maybe I missed a trick or two. I do love the sound though, and find just the barest bit of slow modulation of frequency, level and pan can do wonders.