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almostEric / Frequency-Domain-Manual

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Box Of Revelation frequency parameter mapping #4

Open Xenakios opened 3 years ago

Xenakios commented 3 years ago

It seems like the frequency parameter mapping is skewed towards the high frequencies. (Is it mapped linearly from the knob/CV value to the filter Hz values?) Is this intentional because of some technical reason or an oversight? I think some kind of exponential mapping would be nicer.

almostEric commented 3 years ago

The cube positions do a linear interpolation, but for the frequency param it is mapped to exponential values.

Xenakios commented 3 years ago

The cube positions do a linear interpolation, but for the frequency param it is mapped to exponential values.

But is it exponential in the correct direction?

Here's a spectral analysis comparison (using pink noise as sound source) of Box Of Revelation and the VCV Fundamental VCF modulated by a triangle LFO (Box Of Revelation on above, VCV VCF bottom) :

filter_lfo_mod_comparison1

The VCV module gives a much more expected and "musical" response to the modulation, while the Box Of Revelation hardly spends any time in the lower frequencies. (This same issue is present also when manipulating the panel frequency knob, it seems most of the knob's range is manipulating higher frequencies, and there's not much control at the lower frequencies.)

almostEric commented 3 years ago

to be fair, BoR is a very different kind of filter and yes, it is exponential in the correct direction. thanks for asking. :) The issue is that the Frequency control is less than an actual frequency control of a filter and more of just one more axis for manipulating up to seven parameters (the choice of frequency is useful, but in a sense arbitrary).

That said, I have an idea that can improve things for next update