Some morning reading: http://www.selftuning.com/index2.htm Think they should have this for bass? Is it worth it? Wanna hear Jimmy Page speak? From the webpage: Always being in tune is a great thing Change tuning or pitch while you play Standard tuning to drop D instantly Reduce the need for additional guitars Avoid embarrassing tuning problems on stage Save money by minimizing tuning time in studio Set new moods by changing tuning DURING a song Synchronize your tuning changes to match a song's tempo Take your song writing in new directions I like the idea of changing tune during a song. Sounds like fun. Just something interesting I picked up from slashdot.