How to create a low pass filter on an additive synth?

Sounds promising! There aren't many additive synths like this around except Razor and it's been a while.

You have a good list of harmonic models already,i can't think of a new one...maybe some kind of vocoder? Taking an input,analyzing the harmonics and forcing them on your additive oscillator.

Might be cpu intensive though.

hmmm... I'm not sure if that's exactly hard sync as it's commonly understood. it sounds sync like, but the waveform looks different from what I'd expect

I think it's possible that syncing all the component harmonics individually gives a different effect, was kinda wondering if that might be the case

Yes,Some guy was commenting on how Razor's vocoder sounded really good.

I am familiar with how a Vocoder made with bandpasses sounds like but might be interesting with a sinebank,must be similar since high resonant bandpass basically creates a sine.

i change my mind, it probably is hard sync i think it was just the spiky shape of the waveform that was making me think it might not be

if it sounds like PW with your wavelets, this is because PW is working with a sinus modulation of the level of the harmonics .

You get PW effect by multiplying the level of each harmonic by a sinus rated by the harmonic ratio and the PW, it gives the phase of the sinus ( from 0.0 to 1.0 for each cycle ), starting at ph = 0 with Fratio = 0.

harmonic level = sin ( Harmonic's Ratio * PW ) for phase between 0.0 and 1.0

Frequency of PW = 1/ PW

For a 50% PW , PW's frequency = 2, and you have a hole at every even harmonics.

For PW = 33.33333% the frequency of the PW = 3, and you have a hole in all multiples of 3.

etc....

My guess is that if you make the same thing with a cosinus, you get the additive version.

You should get the simulation of the addition of two dephased clones.

seems the issue is the requirement for both random and smooth. it is however easy to load up an event table of random values, that you can set up to smooth between them

actually pretty trivial to set up an event table as its own low pass filter/ smoother, talkin just simple 1p style lowpass w feedback, and the great thing about this is you control exactly as many and as often of event updates as you want, unlike say the event smoothers are at a fixed rate. think this should work okay if you average every new input with decaying coefficients of the previous output. not totally sure but i think the output might 'blow up' if all numbers are positive and you don't multiply the output by around at least .5

Yes there are a lot of interesting options and possibilities just by playing with sin or cos of frequencies with cool effects (like notches , and then phasers , resonances, band pass, formants , comb filters, etc... ).