I know it's been discussed on here before and I'm being lazy in not looking for it, but on the standard production image (RC1) how do I set the empeg to play an MP3 on boot

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Empeg MK II Owner SN: 118
(Owner of too Many Toys, and a large Debt)
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MK II, (Blue but should be Amber) SN: 118
MKIIa