When -O jack-multi is specified, the individual part outputs have their L-R outputs swapped. This is easily tested by starting zynaddsubfix with -O jack-mult, and utilizing the individual part outputs, and then operating the pan control for the individual parts; turning the pan to the right in reality pans to the left etc.
Weather -O jack or -O jackl-multi, the mixer output is correct, and the both the mix and part VU meters in the mixer pane display the channels correctly.
When -O jack-multi is specified, the individual part outputs have their L-R outputs swapped. This is easily tested by starting zynaddsubfix with -O jack-mult, and utilizing the individual part outputs, and then operating the pan control for the individual parts; turning the pan to the right in reality pans to the left etc.
Weather -O jack or -O jackl-multi, the mixer output is correct, and the both the mix and part VU meters in the mixer pane display the channels correctly.