I picked up guitar again, and found that my MIDI keyboard has a good set of speakers. I have a MIDI to USB cable currently, as well as some 1/4" and 3.5 mm jack cables. The ports on the back of the keyboard are Sustain, Headphones in, Midi In/Out, and power supply. Computer has USB of course, mic in, and headphone out. This is my last resort, as there are no other good speakers that I can use. I want the sound live if possible, too. I'm totally stumped. Even vague answers will help.