Responding to Les Higger's question about tuning one step lower.
One step equals two half steps, not necessarily the next door
neighboring key.  Going down one step (two half steps), C-Bb, B-A,
Bb-Ab, A-G, Ab-Gb, G-F, F-Eb, E-D, Eb-Db, D-C, Db-Cb(B).

Dr. Dave Lunt :)