what is cinch?
doing a quick google leads me to believe you might be meaning RCA
if so, you will have to get a converter since RCA is usually analog and toslink is digital (http://www.colamco.com/store/product...Source=Froogle)
if you are saying cinch is 1/8" stereo like a headphone jack: http://www.music123.com/Hosa-Fiber-O...--i13694.music
Not sure what you mean by cinch??