You need
two 'stereo to mono' adapters like this:
stereo male to two mono female.jpg
To plug into
both the LINE-OUT and LINE-IN stereo jacks as shown with the red arrows in this picture:
SB0LIVE24bitEX.jpg
Now you have 'broken out' the right channel of the soundcard.
Then you need a mono to mono 3.5mm (1/8") male to male cable to go from the Galaxy to the red mono right channel LINE-IN.
Then you need a mono 3.5mm (1/8") male to RCA male cable to go from the red right channel LINE-OUT to your receiver AUX input...
brucek