anoop.sahal wrote:

> Hi Andy!
>
> I do think you have an answer to my predicament. You seem to have
> explained what I am hearing, it does sound like a glitch caused by
> mismatching of sample rates and wave form frequency.
>
> That number of samples error would easily be audible.
>
> The point of all this is could I make descent wavetables for the Doepfer
> module.

As I understand it, (and I'm by no means expert on the Doepfer module).

The Doepfer wavetable is really small, maybe 128 samples( ).

So by editing you would create a single cycle of your waveform that
fits exactly that number of sample.

Then the module will play back at whatever sample rate is needed to produce
the pitch you require.


Really what you need is software like Adobe Audition which lets you
edit at the sample level, and preview the result of a loop.

To get a triangle wave you could generate it in software at the precise frequency.
Or sample it and resample it (in software) to be the exact frequency.

If it sounds right when looped in software (and it probably takes a number
of tries to get it right) then it's ready to be loaded to the Doepfer module.

>
> The example I have heard sounds like a ring modular applied to a tape
> recorder recording.

If there's tones that aren't harmonically related then you're hearing aliasing,
which is what Zoe explained with the spinning wheel analogy.
google "digital aliasing", it's one of the big topics in any textbook on digital sound.


andy