I just wanted to add to this topic, in case anyone else has the issue I had.
I own a prototype DM10 module, acquired by myself whilst freelancing for Alesis during the DM10 sample library development. Sadly, the unit was supplied to me without the original PSU, and when I tried using what I thought was a suitable replacement, I found that the unit powered up and behaved in every single way as I'd expect, except for the major issue of it not outputting any audio! I figured the unit had an internal fault and therefore tossed it into the pile of redundant gear I have accumulated in my years doing work for companies such as Alesis and Akai.
Just recently, I found myself in the market for a new eDrum kit and had set my sights on a DM10 X Mesh, but sadly, due to their discontinuation, couldn't find one, so ended up buying a Crimson Mesh instead. In a bid to make the most of everything I had, I dug out the DM10 module and did a bit of digging around here. A user by the name of RhysT suggested that I'd been trying the wrong PSU. The one I had took my household AC supply and output it as 9V DC. This would power the unit up and allow it to function in every way except outputting audio. RhysT suggested that I needed a PSU that was 9V AC/AC and so I found a suitable unit on eBay and it arrived this morning.
Lo & behold, the DM10 powered up and audio was output!! I am beyond happy and now intend on making this the centre of my kit, with the Crimson unit performing lesser duties for extra percussion pads, etc.
So, if you have a DM10 module that powers up and works in every way except actually outputting audio, check you have the right PSU!