I am a staunch Linux supporter, but I do have extensive knowledge on both sides of the fence. Through a free Windows/Linux third party software application called "LimeWireLinux', I downloaded a WIndows ported application called "Acoustica". This software suite gave me the ability to put my voice along side a classical tune, along with sound effects I got from a customer's computer, (I am in the techno. business). The sound effects were true to life farts, I imitated myself sitting in the crowd at a classical music concert letting go the occasional fart, and tried to hide the fact that it was me who was letting them go. Acoustica blended a classical piece along with my voice and the farts sound effects that put all listeners into tears listening to this masterpiece.
It was hillarious, this Acoustica, I downloaded for free through a shareware application.
It will record whatever sounds come through the speakers of your computer in whatever format you choose from the list of formats it supports. BUT, I do not know if there is a Linux version.