tone generator?

Is there, in the ever-increasing galaxy of MacPorts, a tone generator than can be used to tune a wireless network? Briefly, the idea is to play a tone based on the signal strength, with higher pitches for better signal, etc. Not sure how to do this in OS X. http://forum.openwrt.org/viewtopic.php?pid=10283 -- Paul Beard / www.paulbeard.org/ <paulbeard@gmail.com/paulbeard@gmail.com>