Rossum El-Mu Panharmonium

ksparling · 2019-03-28T03:32:42.778Z

This looks from specs and front panel like an extremely interesting module, and not too dissimilar to something Émilie might have come up with. I’m curious as to other’s thoughts, pros and cons. It seems like a module I would have fun exploring…

rossum-electro.com – 27 Mar 19

Panharmonium

Mutating Spectral Resynthesizer

BennelongBicyclist · 2019-03-28T05:51:59.450Z

ksparling:

This looks from specs and front panel like an extremely interesting module, and not too dissimilar to something Émilie might have come up with. I’m curious as to other’s thoughts, pros and cons. It seems like a module I would have fun exploring…

Some (much) earlier thoughts from Émilie:

So come up to the lab / and see what's on the slab / I see you shiver with antici Eurorack

Good point about the modulations. A drawback of frequency domain effects (FFT > spectral modification> IFFT) - be it convolution or the kind of spectral shaping done by the GRM tools (contrast, warp…) is that parameters need to be constant during the processing of a window. So parameters are “quantized” at the same rate as the window rate. And some effects need loooong windows to offer a good spectral resolution. So in the end, they are fine for “dial a setting with knobs / load a preset, then l…

TheSlowGrowth · 2019-03-28T06:09:21.128Z

BennelongBicyclist:

FFT > spectral modification > IFFT

It doesn’t seem to me like this is such a kind of effect. It seems more like it analyses incoming audio with an FFT and applies the spectrum or a part of the spectrum to a bank of oscillators. So the only lag here is the actual FFT window which can be quite coarse/small if you have a maximum of 33 oscillators anyway.

BennelongBicyclist · 2019-03-28T06:39:01.080Z

TheSlowGrowth:

It doesn’t seem to me like this is such a kind of effect. It seems more like it analyses incoming audio with an FFT and applies the spectrum or a part of the spectrum to a bank of oscillators. So the only lag here is the actual FFT window which can be quite coarse/small if you have a maximum of 33 oscillators anyway.

It depends on what is meant by “…applies the spectrum or a part of the spectrum to a bank of oscillators”. Does it use FFT rather than a bank of band-pass filters as in a vocoder for the input, but a bank of oscillators rather than filters (thus additive rather than subtractive) for the output?

There was also this:

8786_weird_dyes_1_1.jpg598×760 105 KB

pichenettes · 2019-03-28T08:13:14.512Z

This looks great.

Spectral processing doesn’t equate FFT - the panharmonium could very well do its thing with filter banks (and in fact, there is no reason why filter banks wouldn’t be used!).

TheSlowGrowth · 2019-03-28T13:46:30.039Z

pichenettes:

there is no reason why filter banks wouldn’t be used

Oh yes, I see. You can narrow down the frequency range (or broaden it) and the total number of oscillators is quite low - sounds very much like 1-33 variable bandwidth band pass filters. Okay then, so one step further away from the problems of “large window size FFT/IFFT effects”.

zoundsabar · 2019-03-29T16:09:47.911Z

Spectral analysis and resynthesis with windowing sounds like fft to me. This sort of analysis will strip the input of its non pitched components, and simplify its sound into bands and windows, but then there are so many fascinating possibilities in the resynthesis side for beauteous play.

mic.w · 2019-03-31T08:36:27.218Z

bob bliss explaining and demoing the module: