My intention is indeed to do "waldorf style" cascaded wavetables which are interpolated between. I have a program that I can use to test the wavetables, but the issue of tuning remains a problem for me.
Example:
I record a C3 note, 10 seconds of it. Then I want to create a wavetable. Search for a zero crossing after 1 second, chop. Looped playback = C3.
Now I want to have a C#3, so 1/12 of the double of the frequency, playing back at that rate will NOT always provide a C#3.
Why? The sample is the wrong length. The "fundamental" of the note is not perfectly looped, not even all the harmonics are. Hence you "feel" a wrong pitch. Its a bit of a wierd problem.
I've read this page, and figured I should probably check my algorithm that does the rate and frequency calculations.
http://en.wikibooks.org/wiki/Sound_Synthesis_Theory/Oscillators_and_Wavetables
Has anybody got some experience in this domain? I'm new to creating my own wavetables, so experiences / noob-advice welcome :)
-Harry
On , Julien Claassen <julien@mail.upb.de> wrote:
> Hello Harry!
>
> It's an interesting topic, which I had been investigating. I do have a wavetable based hardware synth, but I was thinking about emulating it in software. Waldorf didn't say a lot about creating one's own wavetables. You might just as well try csound - or one of its accompanying programs - to create your wavetables. My synth works in such a way, that it has wavetables, made up from 128 samples. So you should be able to load such a wavetable into a sampler (is Specimin still state of the art?) and then use its envelope generators and filters and whatever else. I suppose the modular synthesizers like AMS, Om and co. might also do your bidding, if they allow to read samples or oscillator shapes. Perhaps even better then a sampler, since they might allow for modulating and otherwise mangling your wavetables. The question is, how many samples per waveform/wavetable they might expect.
>
> If you are thinking about wavetables completely the Waldorf way, that would include having a number of related waveforms stored in one table, so you can morf between them. I don't have the slightest clue, how to be realise that. There I would suggest PD or similar. I'm sorry,if that hasn't been much help.
>
> Warm regards
>
> Julien
>
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