I'm parting ways with a Rascal Audio Analogue ToneBuss 16 channel summing mixer. All-discrete, class-A circuitry with custom wound input and output transformers. This unit was recently calibrated by Joel Cameron (creator of the box). Great piece.
This article best describes my experience with the unit:
https://tapeop.com/reviews/gear/71/analogue-tonebuss/
Cash only, no trades, and happy to answer any questions.