[LAU] Linux programs for creatiing/manipulating sound effects

[Bearcat M. Şandor]

Folks,

I've been thinking about playing with sound effects. For a lot of my
life, i've been interested in the sounds that various things make and i
am wondering if there is a linux program that would allow me to take a
sound clip and manipulate it.  Like taking the sound of a chair squeak
and distort it, stretch it, apply filters to it, alter the tone etc.

Is there a linux gui app for this sort of thing? Preferably in with the
gtk tool kit as i have that all loaded up?

I did some digging around, but i didn't see much. Of course there's
always the chance that i looked at something that would do it well and
didn't recognise it.

What is that kind of program called?

Thanks,

Bearcat