> Thank you for the detailed explanation!
>
> Is this "non-linear transfer function" different than using a
> wavetable as a waveshaper

No. If a sawtooth is used as input it represents the linear input (i.e.
linear increasing input values 0...63). For each input value anoutput value
is stored in the EEPROM and converted into an anlog voltage by a DAC. If you
use a sawtooth as input (or a high-speed VCO that is used to trigger a 6 bit
counter to generate the addresses for the look-up table) one obtains
wavetable synthesis. But it can be treated also as a waveshaper with
sawtooth (i.e. linear) input. Only if another waveform or an
amplified/attenuated/offset sawtooth is used the waveshaping becomes more
obvious.

In other words: if the wavetable is not changed dynamically it's indeed
nothing but a waveshaper. The main difference to an analog waveshaper (like
the A-137 wave multiplier or the A-136 waveshaper) is the digital,
non-continuous behaviour: only 6 bit/64 input steps and 8 bit/256 output
steps.

Best wishes
Dieter Doepfer