SynthMaker

Wanting to create a freq-to-velocity thing, stuck on code

Archive · 2012 3 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

qqwy ·

Hi there.

I am quite new to SynthMaker and to Synth Making in general, but I tought why not give it a try and download the free version. Anyway, I as a simple synth I want to make, I decided to try and make a Shepard-Risset-Glissando tool.

To make the illusion perfect, I need some kind of velocity control. Basically a special kind of filter. It should start at a chosen minimum frequency at 0 velocity, rise until the 'central' frequency is reached, with the velocity increasing. Then, when getting higher towards the maximum frequency, the velocity should decrease again.

Now, I did some math, and this is the formula I came up with:

Velocity(CurrentFreq) = sin2((CurrentFreq*pi/MaxFreq)+MinFreq)

However, when trying to implement it in the code module, I have the following problems: -sin2 doesn't exist. -pi doesn't exist.

What can I do to still archieve this desired effect?

martinvicanek ·

Hey qqwy, welcome to the forum! You might want to look at this thread, perhaps it serves to give you some inspiration. Pi = 3.14159 should be OK, no? Not sure what you mean by sin2, perhaps sin2(x) = sin(x)*sin(x)?

qqwy ·

martinvicanek wrote: Hey qqwy, welcome to the forum! You might want to look at this thread, perhaps it serves to give you some inspiration. Pi = 3.14159 should be OK, no? Not sure what you mean by sin2, perhaps sin2(x) = sin(x)*sin(x)?

oh oh... remind me search next time before trying to re-invent the wheel. Thank you for your reply. 🙂

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