I can hear the song fine but when I add a track or the like I get no sound.

Hi, I am in the middle of putting together a work.

I can hear everything I have done fine.

However when I add a track there is midi going through, because the bar on the left goes up but I can hear not sound at all.

I created a new song but the same thing happens no sound at all.

I did notice when I opened a very old piece that it would play the very last track, which happened to be the kit and when I selected another track it still played the kit.

Your help would be great.

Jonathan