Sharing speakers between IIgs and CD-ROM?

[spector@vax2.concordia.ca (Mitchell Spector)]

	This isn't quite an Apple II related question, however it 
does involve my Apple IIgs and I thought perhaps others here could 
offer some advice:

	At present my IIgs system has a MDIdeas SuperSonic stereo
card, connected to it are a pair of Bose Roommate stereo speakers. 
They of course are connected directly to the card (within the GS's 
case) via a 1/8" phono plug. Now within a few weeks, I expect to
receive an external CD-ROM drive which can play audio CDs through
computer control. The CD has a pair of RCA (left/right) audio 
outputs. My question is, what is the most simple way to connect 
_both_ the CD-ROM and Apple IIgs to my speakers?

	Is there a cable that would let me have them all connected
at the same time and not interfer would sound? (The GS is a bit
"hissy" even when the Ensoniq isn't doing anything). Or perhaps
should I consider a cable with a directional-switch or small
mixer box? I don't want to spend a small fortunate though, just
to share a pair of speakers. :) I suppose the first thing I should
do is purchase a sound cable that will bring the sound connector
outside of the IIgs's case (male-to-female 1/8" cable). Now where
do I go from there...? 

Mitchell Spector
spector@vax2.concordia.ca