What is each end going to plug into?
I've seen 5-pin DIN used for everything from computers to MIDI to quadraphonic. Oh, and of course car stereos and equalizers. Here a some of the possible pin outs just for standard stereo (which is what I assume you are after due to the 1/4-inch plug):
http://pinouts.ru/Home/DinAudio_pinout.shtml
(from the source of all obscure pin-outs, pinouts.ru - they've saved my circuits dozens of times)
Also 5-pin DIN comes in a few configurations, it'll help to know which one you want:
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