The Blues Scale module produces individual pitch voltages and an S-Poly signal representing the notes in the blues scale (also known as the minor pentatonic blues scale because it has the same notes as the minor pentatonic scale but with a lowered fifth added).
The pattern of intervals is 1 b3 4 b5 5 b7.
The pattern of semitone steps between notes is 3 2 1 1 3 2. The small yellow numbers show these semitone differences.
A regular 1 V/Octave control voltage fed to the module’s KEY IN socket controls which of the 12 keys is used. If nothing is connected then the key defaults to C.
The KEY IN signal is used to transpose the scale by simple addition so will handle octave offsets and non-standard tuning, but it’s also used to update the helpful yellow note value labels. So the module is expecting the KEY IN voltage to be relatively stable. For clarity (and to a lesser extent from an efficiency point of view) it’s therefore best if things like vibrato or glides are added after this module .
Individual pitch outputs can be used for transposition, to build chords or be used in generative music patches.
The commonest application is perhaps to connect the S-Poly chord signal output from the SCALE OUT socket to Adroit modules that utilize scales.
The Blues Scale module is introduced in LSSP 101 Tutorial 1.