Need to take your 1/8" aux cable or headphones cable and turn it into a 1/4" so you can plug into a mixer or amplifier?
Then this is what you need. This 1/4" stereo male to 1/8" stereo female adapter can take any 3.5mm plug and make it capable of plugging into a 1/4" jack.
• Connect a 3.5mm cable to a 1/4 inch port
Connector 1 : (1) 1/4in TRS Male