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Okay, will any USB cable work? This one on amazon for instance: [link]
A USB cable thingy, Pianoteq program on the computer and a pair headphones, is there anything else I need? Also, is it possible to make the sound come out of the DP's speakers instead of the computer if I ever want to use it that way?
Printer USB cables are unique. They aren't just regular USB cables. So in the same way that you can't use the micro USB cord from your phone for your 3DS, you can't use it for your printer.
a cable is like 4-8 bucks off amazon
Hands down, THE best USB Cable on the market. Hands down.
You're using the lowest price offered on the 'new' listings. Unfortunately, lots of sellers do things like $0.01 (+ $4.99 shipping). You can see this on the current #100, a USB A-USB B cable