This is an online tool that can help you quickly calculate sound delay based on the speed of sound and the distance from a sounce source in feet. The delay is translated into a rhythmic value (fractions of a beat) and is displayed graphically.
This utility helps you calculate the length of struck metal pipes based on a calibration constant and a desired note.
This utility helps you find a metric modulation corresponding to any arbitrary tempo change. Enter a starting and ending tempo, and it will find a rhythmic relationship for you.