Because only waveforms are sources on the LFO page, just like on the A4.
A tracking multiplier LFO is how filter FM works on the A4, would seem to be the most pragmatic way to implement filter FM on the DN, as there is no place on the filter page 1 for modulation source.
Filter Page 2, however, is a different story… 
Simon of Elektron on the “FM” of Analog Four vs. Yamaha DX FM.
Yeah should have nothing to do with the lfo.
Let the poor lfo do what an lfo does best. Definitely not fm duties.
Don’t know if there is some sort of mod matrix on Digitone.
If so add operator as source and filter fm as destination
Sounds like my first feature request 
There is not.
You really should download the PDF manual from the support section at elektron.se
It’s full of answers.
RTFM. Are u nuts
Literally answering all your questions by reading the manual.
Nuts?
Nah, just logical.
And done.
No not interested enough just yet to read the manual
More just curious at this stage
Seems pretty straight forward
Looking back on his responses in that thread, it’s kinda crazy that nobody predicted an Elektron FM synth! Then again people probably underestimated Simon’s role in product design.
Thought we had mostly predicted a digital synth
FM being the obvious first digital synthesis method predicted.
A lot of us were hoping for a few more digital synth options thrown in the mix though
Yeah, anybody who makes a statement like this was definitely intending to make a new FM synth, sooner or later.
Is FM the best kind of synthesis ever conceptualized? Objectively, yes.
Is the OPL3 chip in Soundblaster 16 the best FM-chip Yamaha has made to date? Yes.
Haha got me.
Anything referencing FM generally gets my full attention 
Sorry if this is insulting but how can this be a serious question? Surely must be a troll thread?
Kind of off topic but @cuckoomusic has forever coloured the way I hear the word synthesis when I read it online heh. I always hear it in my head in his voice.
So is fm. Imo they chose the least interesting digital synthesis method.
Maybe next year they will have an elektron wavetable synth! That I would pick up.
It was split off from a different thread- and titled as best as could be summarized. OP wanted to know if the A4 FM would be sufficient
I’m hoping for a modal synthesis elektron box
@Unifono Guess its to special. In kyma there is a ace modal synth implementation by cristian vogel and gustav scholda. The thing is Called sciphy: http://www.cristianvogel.com/neverenginelabs/product/sciphy
But you looking for a hardwaredevice with knobs and things?
Aside from the one post by Simon (Elektron) buried in one thread, there has been little explanation of the difference between the FM of the Analog 4/Analog Keys and Yamaha DX-style FM, so It’s understandable that people would be confused.
Thus I don’t think it’s trolling to ask.
yes. Like in eurorack mutable instruments elements, rings or the intellijel plonk. Not sure if plonk is modal synthesis, I’m talking more of physical modelling techniques in general.
These kind of sounds in an elektron box would be my dream synth
Same.
Was hoping for other synthesis types in the Digitone.
Sequencing MI elements from the A4 & running it into the external input through fx is still fun though
