Sound quality changed by Kdenlive & LiVES

[lrspares45]

Has anyone else come across this? I have an mp3, recorded with Ardour,
of me playing through BOSS Blues Driver - so far so good.

I then used Kdenlive to create a video, but noticed that Kdenlive had
noticeably cleaned up the sound (taken away some of the fuzz so to
speak), to the extent that the music sounds all wrong. LiVES then did
the same thing! Both have everything at default, i.e. as installed. 

Is there a way of making either app leave the sound alone, or is it just
the way it is?

Cheers
Richard