High-impedance air gap. > On Nov 22, 2021, at 4:49 PM, Steve Cunningham via Synth-diy <synth-diy at synth-diy.org> wrote: > > _______________________________________________ > Synth-diy mailing list > Synth-diy at synth-diy.org > http://synth-diy.org/mailman/listinfo/synth-diy > Selling or trading? Use marketplace at synth-diy.org