Files
The producer delivers a trackout: every element as its own full-length WAV from bar 1, at the session sample rate, with the BPM and key in the file names. Vocal producers deliver the comped lead, doubles, harmonies and ad libs the same way, dry and with tuning printed as separate passes. Ask for the trackout by name rather than "stems"; stems can mean grouped submixes and a mixer needs the individual parts. Demos travel as a two-track WAV plus a lyric sheet.