Having used the original Pacemaker device and loved it whilst also being a seasoned user of vinyl turntables, I had quite high expectation of the Pacemaker app for the Playbook. It wasn't quite what I expected, but generally I reckon its still worth investigating if you do have a playbook since there's a free preview version of the app if you don't quite fancy shelling out 7.50GBP for the full thing. [quick hands on review of the Pacemaker app on the Playbook here]

...or you can click this instead for a quick hands on review of the actual playbook itself as well as a bunch of other stuff like how to load android apps onto the Playook.