You can only store the sample sets on whatever computer is running HW.
In my opinion you’d be much better off, and it would be cheaper, to use a normal touch screen monitor with whatever computer you use to run HW.
An iPad is really meant for things like your email, contacts, notes, pictures, reading books, maps, etc. And there are thousands of “apps” (little programs) that do marvellous things like show you the current cheapest gas stations, and, and, and.
That’s what the 64GB on the iPad is for...those “apps” and books and pictures etc.