I haven’t seen anything posted about this either. But I have noticed that my ears perceive a difference between a mono signal patched only to the L/Mono input vs that same mono signal patched to both L/mono and R inputs - and that puzzled me.
Well, Cardinal/FalkTX is being the good open source citizen here and submitting fixes to Rack but Andrew simply rejects them all with a boilterplate message that Rack doesn’t accept contributions. Just have a look at the closed PR’s for Rack. So good on Cardinal and I simply don’t get what Andrew is doing anymore, at all, and his behaviour seems very counterproductive. Nothing in Rack development or support the past few months makes any sense to me.