Is a live session jam with video even possible?

[DCairns]

I suggest you try Jitsi Meet or Discord for video.  Mute audio, keep video.  It does occupy a bit of your computer's CPU, but doesn't seem to greatly affect latency (unlike the JK video app).  But:  for absolute latency minimization, skip all video.

Thanks for the recommendations.
Do you mean using these apps for video in parallel with JK for audio during a live session?

Yes, exactly.  And, if possible, run the video app on a separate machine so that processing on the JK machine isn't affected.

I would back this. We have 7 folks in 5 locations on a mix of Windows and Mac systems.  We use Jitsi to get the video in to a central system then form a composite using OBS which can be then be returned through a virtual camera via Jitsi. Also it is pumped with re-synced audio into Zoom where our audience is!   JK does an interesting attempt at interleaving the video with audio, but we couldn't get it to work with more than 4 connections. Not clear if this was CPU overload, but there was gradually increasing jitter queue impact and also the set of new(recently introduced) video system bugs which are a pain - just not robust.   We put the video(and Zoom) on a separate machine so there is a dedicated system for audio.