SergeModular

> When I connect my Fenix up , I earth that to the Serge power supply
> & it has always been fine .

Same here.
Never any tuning difficulties just a loss in output volume if I haven't
connected my Fenix or Serge together carefully.
I've certainly never had to ground the midi-cv converter or ground my
banana systems to the mixer. Things are probably different from studio to
studio though.
CW