First get an adapter that takes 1/8" stereo mini plug to 2 RCA (l&r).
The RCA's must be female (2, for L&R), the stereo mini plug must be male.
Second get two 20' RCA cables male to male (l&r)
Plug the (male stereo miniplug to dual female RCA adapter) into your G4 audio output and finally plug your two 20'RCA cables into the adapter and into the input of your stereo.
Enjoy the sonic purity.