asked Nov 03 '18 at 17:40 by Epistemic (31)

edited Nov 03 '18 at 17:41

I've read the user guide, read through Bitwig's website, and searched the internet, and I don't know exactly what "audio rate modulation" refers to. Some people refer to it as "audio rate frequency modulation". Does it respond to peak frequency? Average frequency? Or something more obviously related to "audio rate" like the speed at which the audio changes?... This seems like an unnecessarily confusing descriptor and the documentation I've seen is terrible.

What I'd really like to do is have the EQ-5 band frequencies be modulated to match the loudest frequencies of another track, as a form of ducking.

"Audio rate modulation" is one of the most awesome things about Bitwig, and a major reason that I switched to it! What it means is that modulation is calculated and applied for every sample -- as opposed to, say, every K > 1 samples. Many older systems apply modulation more slowly to save compute resources, but the result does not sound as clean and tight as audio rate modulation.

Example: Let's say the "audio rate" is 44100 Hz. On old systems, modulation might be recalculated once every 25 samples, producing a "modulation rate" of 1764 Hz. But with "audio rate modulation", both rates are 44100 Hz and every sample gets fully calculated.

There is even a step beyond, called "oversampling", where each sample is fully modulated/calculated more than once and then smoothed. And there's some of that going on in Bitwig, too!

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answered Jan 11 at 22:59 by voidshine (48)

Audio rate as opposed to frequencies too slow to hear, so fast movement.

Use the audio side chain modulator and specify the input to be the EQ-5 to get the ducking effect.

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answered Nov 03 '18 at 20:50 by Holon_Mundi (51)

But audio side chain only responds to volume (within the frequencies between the high pass and low pass filters), right? I want the pitch (or loudest harmonics) of the input to alter the position of EQ-5's bands, because the harmonics of both tracks change significantly enough that static EQ won't work unless I painstakingly try to automate it manually.

More generally, I'd like to be able to use frequency as a modulator....

  — (Nov 03 '18 at 22:43) Epistemic

Maybe the Polarity "Dynamic EQ" Bitwig device chain preset will be closer to what I want?

  — (Nov 03 '18 at 23:00) Epistemic

Not sure. You could make a few of them tightly filtered on important frequencies but moving them in parallel with pitch is beyond me. You could keytrack the EQ nodes if you have midi input and if it's not an instrument you can use the audio receiver device to get note information from elsewhere.

  — (Nov 03 '18 at 23:50) Holon_Mundi

Hi, I found a proper indeep explaination here: http://www.moz.ac.at/sem/lehre/lib/ks/lib/fm/fm.htm.html

best regards, Phil

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answered Jan 08 at 09:24 by former (11)

Thanks voidshine! That explains a few things..using audio rate in the grid with a.e a normal sample 44kHz as input Produced in my synth often a very „harsh“ sound-fits to the high frequency you mention.. What i did not fully understood-the type of signal transported-is just common audio, right?- And what it actually changes inside of a synth. (I am a Noob). Trying out, i found in a.e an Comb filter i can use it with the „pitch in“ input (orange) to influence the main signal on the audio in (red). Results are often harsh, Need to process this audio rate first to get nicer, smoother signals..actually, reducing audio rate of the signal might help..

Another benefit of audio rate (as modulator or as grid module): you can store a sample or audio source in a different track than the actual one..

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answered Jan 14 at 18:40 by former (11)

@former: Actually, I think signals in the Grid are 4x oversampled. The audio signals are stereo. I haven't gone deep with the Grid yet but probably some of the folks over at KVR have: https://www.kvraudio.com/forum/viewtopic.php?t=531899

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answered Jan 15 at 06:47 by voidshine (48)

As a noob can‘t really tell what oversampling does to audiorate. However, I observed no difference between the audio rate modulator outside the grid and inside -the audio quality Was about the same for my basic synth. I think, for smoothening the signal, I should try the audio sidechain- the help speaks of „averaging“ the signal. Goes probably the right direction..

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answered yesterday by former (11)

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Asked: Nov 03 '18 at 17:40

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Last updated: yesterday