Hello Clemens, > Because dB levels are not proportional with the perceived loudness. I'm afraid you confuse dB levels with absolute sample values. Logarithmic units (Bel and Decibel) were introduced for the only reason that they ARE proportional to the perceived loudness. > http://msdn.microsoft.com/en-us/library/dd370798%28v=vs.85%29.aspx "Perceived loudness varies approximately linearly with the logarithm of the audio signal power". Regards, Eugene ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/