Click track / tempo guide export

Description: Songs export as a finished mix only. There is currently no way to get a click track or tempo guide alongside a song. Users who want to play or record over a Songer track have no reliable reference to work against. Tempo can be steered by putting a BPM in the Genres/Vibes field or a [Tempo: X BPM] tag in the lyrics, but that is a steer rather than a lock, so the rendered track may not sit exactly on the requested tempo. Without a guide, aligning anything to the song means working it out by ear. Use cases raised: Recording live instruments or vocals over a generated track Importing a song into a DAW and having it line up to the grid Syncing a song to video or other timed material Possible forms this could take: a downloadable click track, exposing the song's actual rendered BPM, or adding a click as an option in the Stems export.