These slide rules simply show every note on the neck for any key you choose with 5 easy hand positions.  This is where you put your fingers for any key.  Easy to use.  Pick a key, set the slide, and play from the 5 hand positions.

Improvise, you really should play in key!

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(Only part of the slide rules showing >>)

A-F#m-D-E

A#-Gm-D#-F7

B-G#m-E-F#7

C-Am-F-G7

C#-A#m-F#-G#7

D-Bm-G-A7

D#-Cm-G#-A#7

E-C#m-A-B7

F-Dm-Bb-C7

F#-D#m-B-C#7

G-Em-C-D7

G#-Fm-C#-D#7

These 12 sets of chords are related, they go together.  There are many chords that go together, this is one set.  The first chord designates the key.  If you have chords and all the notes in that key, you have most everything you will need to play music.