What software/hardware do you use in creating mashups?
IMO, software is really the way to go on this one. I use music hardware for most of my other music making ventures, but the nature of mashups seems to be better suited to audio software. You can really use almost any competent multitrack audio software. I am comfortable with Adobe Audition, and have used it to make a couple of mashups inluding this: http://tomtheisen.com/audio/Prime%20Mover%20-%20Get%20Busy%20(Remix).mp3 This is a self-link of questionable legality, but I am just offering it to show what can be done in Audition. Perhaps the fact that it’s not actually a link it magically makes it OK. In the meantime, check out Boom Selection and Get Your Bootleg On if you haven’t already.