Audio related QT handlers.
Handlers - qtGetMediaEqualizerBands(), qtGetMediaLevelMeter(), qtGetMediaLevelMeterEnabled(), qtGetTrackBalance(), qtGetTrackBassAndTreble(), qtGetTrackVolume(), qtMakeSeamlessLoop, qtSetMediaLevelMeterEnabled, qtSetTrackBalance, qtSetTrackBassAndTreble, qtSetTrackVolume
1) Apparently qtSetMediaLevelMeterEnabled must be called whenever a player's filename is set (not sure about this but without ever messing with enable/disable, I eventually found I had to explicitly use the command to make sure the player returned non-zero values).
2) If you call qtGetMediaLevelMeter immediately after starting the player you'll likely get a "can't get levels" error. A delay of 0.05 seconds after starting the player works fine here.