As far as I know the only Eurorack modules using FPGAs are the 4 Cyclonix/Intelijel ones, Cyclebox, Cyclebox II, Shapeshifter and the Rainmaker. Those were all coded/designed by JJClark (a clever chap). The other company using them is Mungo, I believe all of his modules are using them too.
I own a Cyclebox II and a Rainmaker. I would really like a Shapeshifter (especially now that chord is CVable).
The Rainmaker is amazing, the UI is really well done (was that you @kisielk?), so itās easy to get at things quickly. I use the comb section a lot more than I thought I would. But I still only ever feel like I scratch the surface of it.
The only thing I get a bit frustrated with on the UI is setting up the internal routing, levels and dry/wet of the delay section. Those things I wish I had more instant access to.
I did own a Mungo D0 at one point, but I hated it. I could just about cope with the zoom controls⦠but the fact that it lost itās settings on power down meant that I kept have fight with the zoom to dial my delay back in again and again and again. Luckily I found someone interested in a straight swap for a Modcan Dual Delay (I went out of my way to check they knew the deal with Mungo modules and the controls as I would have felt far too guilty making such a swap, luckily they already owned a G0).
The Dual Delay is probably my favourite delay mainly because when itās in resample mode and clocked with a sync signal, the delay CV controls the division and is quantised. So under CV control your delay can switch between 3/16 and 1/4 (or whatever else) instantly and without missing a beat. Itās magical.