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Old 4th July 2007
  #8
Gear Maniac
 
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Probably it means that the first transient happens when the skin (thus the air) is moving to one direction as hit by the pedal so the overall sound at that stage is influenced heavily by the negative (in this case) portion as detected by the mic. That can happen also with synthesized percussive sounds or samples with very fast attack and decay stages. Some other instruments (many wind ones) show constant DC offsets when recorded, probably because of the constant direction of the cause of vibration, the player's breath.