Copy W
Authored teaching scenario. The features below are constructed to show how a shared property is reasoned about. Nothing here was measured from a real tape, a real deck or a real recording.

Features present:
  F1  throughout    Broadband noise floor raised by about 9 dB
  F3  throughout    Mains hum at 50 Hz
  F5  00:04.900     Door closing, 300 ms
