[gravitronic]

there is a DAW with that feature, they then extracted the multiplayer core and license that. Forget the name, though.

[NikkiA]

I feel like you could be referring to NinJam and Reaper, but probably aren't, because it's not hard to remember reaper.

[conradfr]

Never tried it but there was was Ohm Studio from French company Ohm Force.