I've found a bug, probably caused by DirectSound Output or Nullsoft Windows Media Decoder.
After Winamp loads, the first song it starts playing (automatically or manually), if it's a wma file, the first split second of audio playback is high volume. To reproduce, set the Winamp volume to a low level, where you barely hear it playing, then close it. Now open Winamp and play the sample wma file, from below. Using the same Winamp session, restart playing, to hear the normal volume for the start of the audio file. Close Winamp to repeat the steps.
Windows 7 SP1 x64, Winamp 5.666 3516, clean install, Realtek ALC889.
http://www.theflute.co.uk/media/Bach...nataAmin_1.wma