Yes , it's a printer cable as printers feature the same standard USB interface.
http://www.ebay.com/itm/10FT-Foot-HP-Ca ... 1560504140Don't get too obsessed with connecting it to your computer though. You can transfer files into the 4000 using a USB flash drive using the USB input at the front of the unit. Just load up some sounds, download the manual and start working your way through it, make a basic drum kit and record a basic sequence etc. You can try connecting it to your PC later, it's not a requirement, the MPC4000 is a standalone beast.