Expert Sleepers tells us that Persephone is a VCA (Voltage Controlled Amplifier) using a discrete JFET as the gain element. The JFET can be tastefully (or violently) overdriven for saturation/distortion effects.
They say that Persephone also includes a zero-crossing detector, which can be used to restrict gain changes to zeros in the audio waveform, preventing clicks and pops that can occur with very fast envelopes, especially on lower pitched sounds. In fact, with the zero-crossing circuit engaged, you can use a simple gate as the CV input without clicks.
The module's signal and CV paths are 100% analogue (there is a little discrete logic involved in the zero-cross circuitry).
Pricing and Availability:
MSRP: UK £159 (inc VAT), US $185 (exclusive of sales tax), EU €185 (inclusive of VAT)
Sampling, live FX and performance
Uses a unique ball and spring model
If you want a compact sampling workstation
Blimey. How Much?