Using StereoTool 9.34 JACK on Linux - Ubuntu 18.04.2, more specifically. I can successfully use either FM Output or Normal Output without issue, but together, I get silence and no sound out on either. The MPX on the FM Output disappears entirely, as well.
Here's the console output right after I click "Normal Output", with FM Output already going:
Jack buffer granularity: 1024 samples
Activating Jack b185260
Jack connection opened
Nothing appears to be out of the ordinary. I've reset StereoTool many times, to no avail. Similar to my previous bug report, I've had this bug since I started using StereoTool in the 8.x (or maybe it was even 7.x) days, and could never get this working under Linux.