If your mixer has a tape in (pair or RCA jacks), and you are using the headphone output of your laptop, you'll need an 1/8-inch stereo male to a pair of RCA males to make the connection.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)