Avoiding Audio Aliasing On Web Music Options

[Liberty]

Hi there,

A film production company is uploading excerpts of my score on their movie's website, which is cool, however, the sound has dreadfull aliasing !

As it seems I am the only one who cares about this, does anyone out there knows how to avoid this nasty noise ?
Source audio is clean mp3, Joint Stereo at 128 kb bitrate.

I read that anti aliasing, low pass filters do exist…
Are there any Plug Ins available, or can I manage this issue within MOTU Digital Performer ?

I am using DP 4.61 on G5 dual, running OS10.3.9

Many thanks in advance.

Liberty