I only found those videos yesterday. If you search Youtube for 'drumless' then various things come up. The drum unit has lots of preset kits, but you can make your own too with lots of sounds to choose from. I think I need to try that. I was using a 'heavy rock' kit. This unit has some limitations compared to the more expensive ones such as not being able to change the relative volumes of the drums, but it's good for learning.
!BEER