Hi papamosca,
Qmod is a standalone program
Just unpack the zipfile in your home folder. You can make a link to your desktop for easy access.
Connect a audio source to your audio card, then start Qmod.
If you don't want to use your standard audio IO go to Config and select the devices tab and select the preferable device and buffer size, then active the new settings.
Please read the manual for more info.
Have fun,
Cor