> 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.

Yes, that's right, only it's double that amount. So in sampler mode, it stores a single sample that's 65536 samples long (if you see what I mean), and in wavetable mode, it stores 256 of them, each one 256 samples long.