LOL - it does, actually. It's in the manual.
Hold the mode button and press the rhythm button (or maybe that's the other way around, don't quite remember - but it's the same process to switch between volume and tempo) to switch between banks. It has 3 banks of 3, so nine beats overall.
Edit: My vote here goes to the Amplug, especially at its price point. You'll also have to have a 1/8" cable from your computer's headphone out into the Amplug. You could probably use this at the end of your pedalboard if you have a long enough cable to the headphones you'll be wearing, and if you use the low gain setting on the Amplug (bass model).
There are definitely other options.....but this would probably do the trick for what you need, and it's inexpensive enough that you could buy three for the price of anything else on here.