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.

-18 dBFS is the usual UK line-up level (EBU R68). -20 dBFS is included for US-referenced kit (SMPTE RP155).
The sweep runs logarithmically from 20 Hz to 20 kHz.
