Expert Sleepers Introduce Persephone JFET VCA For Eurorack Systems

Expert Sleepers has introduced Persephone, an analog VCA (Voltage Controlled Amplifier) that uses a discrete JFET (Junction Field Effect Transistor) as the gain element.

The JFET can be tastefully (or violently) overdriven for saturation/distortion effects.

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. 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% analog.

Pricing & Availability

Persephone is available now, with the following pricing: UK ยฃ159 (inc VAT), US $185 (exclusive of sales tax), EU โ‚ฌ185 (inclusive of VAT)

7 thoughts on “Expert Sleepers Introduce Persephone JFET VCA For Eurorack Systems

    1. there is a delay effect on the signal so it takes a few seconds to hear the clean state on this example, whoever did this demo seem to miss that.

      1. no no I got that there is delay running,
        hm, how to say without the plop from the non zero crossing the transient is very different,
        u can actually hear what the envelope is doing without the plop ๐Ÿ™‚
        I guess the signal is now half a cycle or whatever to late, but no-one can year that.
        it still goes a little plop plop but this sounds way better than an vca without zero crossing detection.
        makes me wonder why this isnt the standard.

        1. it does whatever it would if the cv input would start/cut at 0V, check other videos it’s completely click free. but anyway it’s just a feature it doesn’t sound “better”, clicks can be great, depends on the material.

          1. I disagree completely.
            this beats the crap out of any amp vca without 0xing detection.
            it sounds way way better. ๐Ÿ™‚

            clicks are great when u can control them
            a standart vca just clicks,
            u have no control over it, make it shorter, longer, softer, silent …
            thats shit ๐Ÿ˜‰

            1. we didn’t use analog if we wanted to fully “control the sound”. It’s depend on the material and your taste. you can argue this is what you like but why do you think es put a button to turn this feature on and off?

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