Jamming online in real-time is possible only between participants in the same city or district. It all boils down to internet-induced latency. More than 20ms and no real-time is possible. For long distance (high latency) online jamming, there is Ninjam [1], developed by Cockos, creators of Reaper DAW, where latency is actually expanded to match a musical division (bar), so everyone can jam in non-realtime but still musically correct.
For long distance collaboration and recording (not jamming), I'm currently working on developing a Reaper + Sonobus (which uses AOO) solution which I named ReaConnect [0].
For long distance collaboration and recording (not jamming), I'm currently working on developing a Reaper + Sonobus (which uses AOO) solution which I named ReaConnect [0].
[0] https://github.com/AtmanActive/ReaConnect
[1] https://www.cockos.com/ninjam/