RE: Your guitar or mandolin might already be capable of 11 or 13T ET!

This has been mentioned before -- moving the bridge so that a non-12 fret is
at the octave does _not_ result in an ET. Work out the math for yourself if
you don't believe me. For 11 or 13, the approximation may be kinda close,
but someone recently thought they got 15-tET this way when in fact they were
nowhere near it.