Hi Julien,

2012/9/4 Julien Claassen <julien@mail.upb.de>
Hello Jostein!
  Nama can basically do this. You can start/stop via spacebar, you can have a recorded clicktrack or use the clicktrack LADSPA plugin. Youcan of course have multiple channels out.
  but I'm pretty sure, that Ardour can do the same and more for you as well.
  If you want the really easy way, you might give mplayer a try. I think it does support multiple channel output. No real clicktrack though, so it will have to be recorded. But you can have a playlist and work your way through it. You need multi-channel audio files though, no individual track-files as such. but these could be created.

 I will have a look at Nama, thanks! :-)

Ardour can do a lot of this, but it's nothing I want to setup and deal with when performing on stage, I have other worries under that circumstances:-). I just want to tap my foot on something and then the right song should start at once - and the next one in the playlist next time I tap. The easiest way for me might be mplayer in combination with a simple Bash script. 

Jostein