i have a pioneer too and i can hook a cd changer up to mine also, but i am guessing that on urs , that is the thing to control the cd changer or whatever.. just a guess
Usually it means you have input capabilites with your deck instead of only output. (ie cd changer or walkman etc etc) But without knowing much about your deck (or the lack of time to look up your certian deck right this second) I won't say 100% that's what yours is implying. the_Raven, 4uhaterz, Tiny, or this sections Mods should have no issues verifing this.
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