Plug the mic into the SL1. In the middle left of the screen is the mic/vinyl recording area (vinyl only in v1.5). Basicly just hit the red record button (looks like a red dot), talk into the mic or whatever, and hit the red recording button again to stop the recording. Type in a name for the recording in the right side area and hit the disk-looking save button. SSL wil create a crate called Recorded. It will be in there. Drag it onto one of the players and scratch away!
Here's a little pic explaining it, don't mind that it says vinyl, the process is the same...
i48.photobucket.com
