In reply to:
If I were to guess the "blue" from the amp is a remote turn-on sense lead to power up the amp
Yes, that's what the blue wire is for. I spoke to someone at work who reckoned my minidisc wouldn't supply enough power to the amp to be able to hear anything. I thought that this would be the same as the empeg, then. He also suggested that I would need something with a powered line out like some discmans have. My empeg is currently being repaired so if I don't get it back before the weekend i.e. tomorrow, then I may have another play.
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Steve - 18GB Mk II Blue