[sdiy] Pilve iG00156AP - new Yamaha CS-80 VCF chip clone costing $80

[Gordonjcp]

On Fri, Aug 28, 2026 at 10:15:44PM +0200, cheater cheater via Synth-diy wrote:
> https://synthanatomy.com/2026/08/pilve-ig00156ap-is-a-new-yamaha-cs-80-vcf-chip-clone.html
> 
> sold only on Reverb so you know it's an amateur outfit but hey, at
> least it shows a homemaker can clone the CS80 VCF?

It's just a pair of SVFs in series. You won't get the exact OTAs that Yamaha used (they were proprietary but rather like Roland's BA662 probably just the guts of a CA3080 repackaged) but there's nothing especially magical about them.

Now the GX1 filters, that's a different beast altogether and apparently have only yielded up their secrets to a couple of people. But from what I've seen, if you wanted something GX1-y then you'd start off looking at the Sallen-Key filters used in the Korg "mini" synths with their diode bridge, or maybe the MS50.

-- 
Gordonjcp