I just spent an hour playing around with this and I have no regrets.

• You can start and new composition by going to this icon
• Maybe even switch the drum sounds to a beatboxer here

For those who wish to understand it better:

• Four boxes in a row represent semi-quavers (ti ki ti ki) 
• Every other box represents quavers (ti ti)
• The first box of every group of four represents crotchet (ta)

However you use it, I’m sure you’ll have fun.