sourcesMap:: Map Int (String,SoundSourceConfigOption)
sourcesMap = fromList $ [
    (0, ("Pink noise", Resource "pinknoise.wav" (Just $ Sec 2))),
    (1, ("White noise", Resource "whitenoise.wav" (Just $ Sec 2))),
    (2, ("Load a sound file", UserProvidedResource))
  ]
sourcesMap:: Map Int (String,SoundSourceConfigOption)
sourcesMap = fromList $ [
    (0, ("Pink noise", Resource "pinknoise.wav" (Just $ Sec 2))),
    (1, ("White noise", Resource "whitenoise.wav" (Just $ Sec 2))),
    (2, ("Load a sound file", UserProvidedResource))
  ]
sourcesMap = fromList $ [
    (0, ("Pink noise", Resource "pinknoise.wav" (Just $ Sec 2))),
    (1, ("White noise", Resource "whitenoise.wav" (Just $ Sec 2))),
    (2, ("Load a sound file", UserProvidedResource))
  ]