It sounds like you're referring to Prodigy Multitrack — possibly a guide, tutorial, or workflow for using the Prodigy annotation tool with multitrack (or multi-turn/multi-step) labeling setups.
Eli could have made money; he could have built a career as gatekeeper. Instead he kept a calendar at the edge of his table and a sign-up sheet that read “one hour per person.” He was protective the way a gardener protects a small, rare plant. He watched people leave transformed—more certain of a line, more willing to tolerate their own imperfections. He learned to recognize a stage fright that loosened when an imperfect harmony arrived, as if the machine insisted on their right to be flawed. prodigy multitrack
Benefits of Using Prodigy Multitrack
This track is a masterpiece of sampling. The official multitracks for "Smack My Bitch Up" are legendary because they reveal exactly where the samples came from (Ultramagnetic MCs, Kool & The Gang). The stems include the reversed piano, the "Change my pitch up" vocal, and the distorted drum loop. Producers study this multitrack to learn how to layer funk breaks with synthetic kick drums. It sounds like you're referring to Prodigy Multitrack