How do I record my guitar using the Peavey 6505 Combo MSDI?

You will need to get an Audio/Midi USB computer Interface like the Avid Mbox (3rd Gen) which has an XLR port that you can connect to the MSDI™ microphone-simulated XLR direct output from your Peavey. This computer interface also has a built in broadcast quality sound card that will give you totally awesome sound reproduction. It also comes with Pro Tools LE software to record with on your computer. If you have a TASCAM or other digital recorder and are not using your computer, then you may need an XLR to TS or TRS (whatever your recorder has for input) adapter in order to connect your Peavey to the recorder.