I know this is an old post but... I think I have good news for you. In version 5.00 I have finally cleaned up a lot of code, which includes moving a lot of Windows specific code to a single file.
I've just managed to get the command line version working on Linux - with some issues (most importantly that I cannot load .sts files because that was built using a Windows API - I'll have to write my own implementation for that).
But stuff like this is already working:
cat o.wav | ./a.out - - | aplay
Which immediately starts playing the processed version of o.wav
The GUI might indeed be problematic, but the command line version is very usable in Linux, especially if I were to expand it a bit (control via parameters, eg. setting input and output sample rates etc.).