You'll have to either buy an audio interface, or a mixer that has a sound card built in. I'm just a bedroom producer/DJ but I've had the Native Instruments Traktor Kontrol Z2 for years and I really like it. Has a built-in sound card, and you can probably find them relatively cheap on the used market.
Hope that helps
Post your questions, opinions and reviews of the MPC1000. This forum is for discussion of the OFFICIAL Akai OS (2.1). If you wish to discuss the JJ OS, please use the dedicated JJ OS forum