> What is the purpose of the wavetable generator?
I'm curious too as to the limitations of our existing synths for growls and
whether or not we can leverage/enhance what we already have rather than
adding a new one.
- [email protected]
On Fri, Aug 22, 2014 at 8:28 AM, Vesa <[email protected]> wrote:
> On 08/22/2014 09:17 AM, Ian Sannar wrote:
> > I have this idea for a Dubstep Growl Synth.
> > I've made the basic wavetable generator in C#.
> > I moved it over to ruby and made it a VSTi in FlowStone.
>
> What is the purpose of the wavetable generator? We already have a
> wavetable generator which generates mipmaps for bandlimited waveforms.
> Although we don't generate them live anymore, and instead provide the
> wavetables as pre-generated binary files.
>
> > It's a basic FM synth. Two waveforms. One waveform is the basic
> > multi-osc, like from TripleOscillator. The second osc is a wavetable.
> > Osc 2 is a frequency modulation oscillator, and oscillates Osc 1.
>
> Seems quite specific and limited for a whole synth... But if you want to
> code it, go right ahead. It's pretty easy to write synths for LMMS.
>
> > Osc 2 is generated dynamically. A knob controls the wavetable position.
> >
> > This psuedo-code generates Osc 2.
> >
> > float[] GenerateOsc2(int wavetableQuality, int sampleRate, float mouth)
> > {
> > step = 1.0 / sampleRate;
> > wavetable = new float[wavetableQuality];
> > for (int i = 0; i < 1; i += step)
> > {
> > position = 1 - i;
> > ampEnv = (float)(1 / Math.Pow(position, 2));
> > wavetable[i * SampleRate] = -(float)Math.Sin((position *
> > Math.PI * (2 * mouth))) / ampEnv;
> > }
> > return wavetable;
> > }
>
> If this is only called once when the synth is initialized, then it's
> probably fine. Otherwise there will be problems...
>
> > The FM Modulation is your average Frequency Out = Frequency In + (Mod
> > Osc * FM Gain) function.
>
> Not a good idea. While writing Monstro, I learned that you won't get a
> "proper" FM sound (or what you probably would recognize as "FM sound")
> by doing actual FM.
>
> Doing actual FM will cause pitch drift, which makes the whole synth
> sound out of tune. What you want to do is use phase modulation to
> approximate FM, this gives the recognizable FM sound and keeps the pitch
> constant.
>
>
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