Everything else should just work. But if you are having problems, here are some detailed testing instructions.
WorkOnMe
Audio testing is simple. Plug a jack into your x0x0b0x, and the other jack into your mixer, or an amplifier, and away you go. One (or both) jacks don't work, it is almost surely a problem with either the Headphone amplifier or the Mixer section.
Connect your multimeter to the tip of the CV jack, and ground to the sleeve. Set the x0xb0x to KeyboardMode, and press the lower C key. You should see 2 Volts DC(?). Press the upper C key, and you should see 3 Volts DC(?).
For the gate, do the same, and press any note key. You should see 5V DC when pressed, and 0V DC when released.