[gentoo-user] Decreasing volume of an mp3 audio

Hi,

 is there an application, which is able to physically decrease
 the volume level of an mp3 with as less as possible loss of
 sound quality.
 (Background: I am merging video parts done with my webcam
 with sound trailers. Volume of the webcam's mics and
 the volume of the mp3 should be not too different.)

 Thank you very much for any help in advance !
 Best regards
 ]|[cc



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