ErikZalm/Marlin — pull request #875 by IVI053 (2014-04-12 11:28:22+00:00)
Title: Transducers and buzzers are not the same

Added parameters for buzzers to change tone and added some explanation to config.
Striped some redundant white spaces

Tested with RepRapDiscount Full Graphics Display. Should work with any buzzers but resulting tone varies depending on type so no absolute parameters like Hz, just tone color.