Audio Question on 99 Accord EX Coupe

I have a stock Honda CD player in my car and I am having all kinds of problems playing burned audio discs. Some work and some don't and there doesn't seem to be any rhyme or reason behind which ones play and which ones don't.

That being said, I was wondering if there is any way to utilize the CD changer input to input another audio source such as an mp3 CD player. Are there any adapters that allow you to use that CD changer input for anything else?