Lynda Sayce has recorded some video backing tracks of lute duet parts. The idea is that you can play along with the video to make your very own lute duet with a professional player.
The assumption is you have a lute in G, with A=440.
You can play either Lute 1 or Lute 2 with this duet. You can slow down (or speed up!) the tempo using the settings button (a little cog icon at the bottom right hand corner of the screen).
Here are the videos, including a short tuning up video: