I'm on macOS 10.12.5 and I use Soundflower  to route audio from VoIP apps (Jitsi, WebEx, and FaceTime) through an audio mixing app. I use two Soundflower instances, one to feed audio to the VoIP app's input (called "Soundflower (2ch)"), and one to capture the VoIP app's output (called "Soundflower (64ch)"). Soundflower is a kernel extension, so in user-land they appear as normal audio devices.
In Jitsi's audio device prefs, both devices appear in the drop-down menus as expected. When I select the 64ch one, the setting flips back top the 2ch one, however. The 2ch device is used fine, and audio flows between it an Jitsi. I just can't get Jitsi to use the 64ch device.
FaceTime and WebEx can use the 64ch device just fine.
Any hints appreciated.
Many thanks in advance and cheers,