CableCreation 3.5mm to 6.35mm TRS Stereo Audio Cable 2M, 1/8" Male to 1/4 Inch Male TRS Stereo Aux Cord for Steam deck, iPod, Laptop, Phone, home theater, Amplifiers, Speaker, Mixer : Amazon.co.uk:
iRig Mix Mobile Mixer for iPhone, iPod touch and iPad - djkit.com
How to Add Digital DJ Gear to Your Existing Vinyl or CD Set-up