Relative Minor Of A Minor Chord - Say What?

Most of us are familiar with the concept of relative minors, and how they relate to 6th chords. The 6th chords contain the same notes as the m7 chords, but the bass player uses a different note as the root.

C6 = Am7
D6 = Bm7
F6 = Dm7
G6 = Em7
A6 = F#m7

For many years I've struggled to find m7b5 chords (a.k.a. half diminished) from jazz charts on my guitar. Recently I came to a startling revelation - they contain the same notes as m6 chords, in the same relationship as the relative minor. Check it out:

Cm6 = Am7b5
Dm6 = Bm7b5
Fm6 = Dm7b5
Gm6 = Em7b5
Am6 = F#m7b5

The m7b5 is the relative minor of a minor chord. Sort of. Anyway, it helps me find them on the neck, and that's what counts.

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BP on the Roland HandSonic HPD-15

The Roland HandSonic HPD-15 hand drum includes some tuned percussion instruments. You can edit the pitch of each pad in cents.  The pads are grouped into 3 sets of 5, as shown:

You can edit the pitch of each pad individually, and further adjust the pitch of an entire set (A, B or C).  The pad set adjustment is very helpful when creating a patch for any HPD-15 instrument that is voiced for a higher or lower octave.

After several experiments, I finally settled on this arrangement of the Bohlen-Pierce scale notes.  It is fully chromatic from D to D'.  I didn't include a low Db as it seemed less important than the high D' for modal music. 

I tuned the notes to the C Lambda scale in just intonation with A=440 Hz (pad A2).  The first song recorded with this system was Fuse Blue.  The HPD-15 is somewhat buried in the final mix. I've created a separate MP3 file of just the HandSonic tracks so that you can hear what it sounds like: FuseBlueHandSonic.mp3.

I'm happy to answer any technical questions from other HandSonic players who are into BP or other alternate scales.  The HPD-15 isn't a real sensitive instrument, but its fine tuning capabilities make it a very useful tool for creating a variety of sounds in real time performance.