The 4-track limit means you can build a hardware DJ controller that supports stems. It also means your software doesn&#x27;t have to have a crazy unlimited-track interface. 4 tracks is the sweetspot where you can actually build usable products around this for live performance.<p>Clarification: When I say build hardware, I mean design a usable hardware interface for mixing 4 stems. I don&#x27;t have to guess what audio is on what track. Imagine what a nightmare it would be if every stem had a different number of tracks and you were trying to DJ live with them.