If you've just got your freebie version of Tracktion, you might enjoy this, a handy guide to making bootlegs/mash ups using the software. It was written by Philip Meehan, the sound effects boffin and orchestral arrangement expert who also designed the Tracktion logo. His mix of Madonna's 'Frozen', Tiga's 'Hot in Herre' and Britney's 'Slave' is pretty much bonkers.