Why I get FM when I put the Pulsar Dual LFO through a filter?

[rlaghcks489]

hello. First of all, I don't speak English very well, so I'm using a translator, so my sentences might be a little strange.

That being said, I did an experiment.
I put a Sawtooth basic waveform in the 'Mimic creative sampler' and brought up the Channel EQ and Pulsar LFO.

I gave LFO1 and 2 both Rate and level maxed out at 1.05kHz and 100%, respectively, and LFO2 was patched to modulate the Rate of LFO1. I then patched the final LFO1 signal into the LPF of the Channel EQ, but when I checked the spectrum, it was definitely FM, causing sidebands. (I could be wrong, please let me know)

If I turn off LFO2, which modulates the rate of LFO1, it only sounds a bit simpler, but the FM is still there.

I've patched a fast (definitely a pulsar LFO) LFO with 1.05kHz in the LPF in the filter, so why do I get FM?

Any help would be appreciated, please let me know if I'm wrong. Thanks.

[selig]

You get FM because you MADE FM when you frequency modulated one oscillator with another, the definition of FM ("LFO2 was patched to module the rate of LFO1" = FM).

But what you may be seeing is strong aliasing, which also produces sidebands. If it's aliasing, the 'sidebands' will move contrary to the frequency of the oscillator, compared to FM where the side bands move in parallel with the frequency of the oscillator.

I'm assuming I reading correctly you are not modulating the LPF in the filter, simply passing the audio through it (via a mix channel) to be able to see the spectrum display?

[rlaghcks489]

I am attaching a photo to help explain.

The first picture is a picture of the patching I did, and the 2nd and 3rd pictures are before and after LFO1 was patched to LPF (here LFO2 is turned off).

[rlaghcks489]

And if I understand correctly, it is definitely FM that modulates the rate of LFO1 by LFO2, but the result of patching LFO1 to LPF is not an FM effect, but an aliasing phenomenon?

[Bes]

any audio rate modulation of the frequency of a filter should be called FM

[deeplink]

I would call it fm, but (and someone please correct me if I am wrong);

Yes, if you modulate a filter's frequency with an Oscillator - it's filter FM. This can be seen in the context within a Thor.

But, when you're using external CV - say from Pulsar into a another device like Thor - the bit/sample rate (?) of such CV is not that great - and so the results are more a distorted version of FM than true FM.

My example:
Take Pulveriser's LFO and send that LFO to Pulveriser's Volume (this is done internally). You can achieve some AM modulation.
Take that same LFO and instead send it to the CV Level input of a 14:2 Mixer - you get different results.

Everything above is an assumption I have made, hoping someone can confirm or educate me!