Add a GuitarForLinus.mp3

Bass and guitar sounds different, for those which don't have the hardware or don't play an instrument, that would be a precious addition. Even maybe the intro of U2 "Pride in the name of love" and "Zooropa" recorded dry on an electric guidar with single coil pickup, as they have great guitar effects (based on double delays).

Thanks for your coding quality applied to DSP.