I'm not super great at math.
I own three of these. Bought a few used ones to backup my old college unit (primary) when I had to send it in for repairs. I was lucky there is a guy collecting old ones for parts and had the skills to do the fix. He had to change out my keyboard. If it was not repairable, he offered to buy it for more parts. Iimmediately bought two more. $50 each. One is brand new looking.
That app looks pretty cool. If you understand the concept, I don't mind the tool to get you the end results.
Sent via Jedi mind trick.