Reply #8: It'd never work for slack key

[KamaAina]

Slack-key guitar is a popular style of Hawaiian music in which the guitar is detuned intentionally. Originally, the idea was to make the tuning match a particular singer's voice.

http://en.wikipedia.org/wiki/Slack_key_guitar#Techniques_and_Tunings

Nearly all slack key requires retuning the guitar strings from the standard EADGBE, and this usually (but not always) means lowering or "slacking" several strings. The result will most often be a major chord, although it can also be a major-seventh chord, a sixth, or (rarely) a minor. (There are examples of slack key played in standard tuning, but the overwhelming majority of recorded examples use altered tunings.) The most common slack key tuning, called "taro patch," makes a G major chord. Starting from the standard EADGBE, the high and low E strings are lowered or "slacked" to D and the fifth string from A down to G, so the notes become DGDGBD. As the chart below shows, there are also major-chord tunings based on C, F, and D.

This guitar would drive a slack-key player nuts! It'd constantly be trying to retune itself, thus runing the slack-key tuning!