I use Jam Kazam a couple times a month, but don't use the FM3 as part of the system. We bring our singer in from about 350 miles away, the rest of us are in my rehearsal space. We have two room mics set up so our singer can hear us, and we route his vocals through the rehearsal PA. Then we throw up a facetime session on a separate computer so we can see each other - video only. It works shockingly well. Some nights we have more latency than others, but it's absolutely doable for us. Using wired ethernet out to 1GB fiber so my end of the connection is solid.
Our singer also does 100% virtual rehearsals with Jam Kazam with another one of his tributes. He's 350 miles away from the rest of that band, who is spread over a 50 mile local radius.
I don't see any reason why the FM3 wouldn't be a good interface for individual Jam Kazam use.
