Made by Granary Digital, www.granary.digital. Free to use. 48 kHz, 24-bit mono WAV. Levels are RMS: a -18 dBFS sine peaks at -15 dBFS.

SMPTE linear timecode at 25 fps (the UK frame rate), starting 10:00:00:00, 60 seconds, at -12 dBFS.
Feed it to a camera or recorder timecode input, or decode it in your editing software, to check sync.
