The looper controls work fine, I'm using de Bouncer2 library to detect button press with very short interval and BOUNCE_WITH_PROMPT_DETECTION option to detect it immediately, it would be faster using the press event but I'm using the release event to avoid firing a message when long press or double press is used although I may change it to press just to test. One recommendation is to not use the sleep function, this is important to make it more responsive.