Jimmy, Dave,
I've found 2x 20K resistors in an electronic store in Paris. I'll try this week end to sum the 2 signal from XLR to pin 4 of the jack i.e.:
- orange signal to pin 2 XLR + 20k resistor from pin 2 XLR to pin 4 of the 1/4jack.
- violet signal to pin 3 of the XLR + 20k resistor from pin 3XLR to pin 4 of the 1/4jack.
I'll let you informed if any progress.
Regards
Franck