I know this is do-able as there's videos of it online, but I'm not sure I want to try it and risk wrecking my drum machine. Anybody know anybody that does this kind of thing? Here's a video of exactly what I want:

Is it a Rythm Ace drum machine like in the video?

It's not exactly the same, it's the FR-2L, which is a different shape but should be the same, in principal, to work on.

This is the one he's moded:

This is the one I've got:

Dunno. Might be worth firing an email to Kenton to see if it's possible http://www.kentonuk.com/about/contact_us.shtml . Obviously shipping to the UK might be expensive, but maybe affordable given unit doesn't look that big.