[Regenaxer]

I should explain more clearly how to generate an arpeggio in PentiKeyboard:

The rules are: 1. The last key must be pressed AT LEAST 80 ms later than the second. 2. The last key must be pressed MAXIMALLY 240 ms.

A backspace (DEL) is generated with middle and index finger.

While pressing middle and index finger simultaneously (or longer than 240 ms) gives an "l", you get a backspace when you first press the middle finger (as long as you like, but at least 80 ms), then make a short tap with the index finger and immediately release both fingers.