If you could give us more info it would help.

- Vista? There is an issue with BIAB and Vista that has to do with the UAC (User Account Control)
- What message(s) do you see at the top when you hit Play?

It takes my 1 year old laptop about 12 seconds to generate a 32 bar song with two RealTracks.

As pointed out, each time you hit Play the song regenerates. Use Replay to get around this. To see if BIAB wants to regenerate, right click on the Combo part. If the line 'Song has changed, needs regeneration' is checked, it wants to regenerate. To get around it, uncheck that line and press Replay.

Rachael