simple 7-chord touch-pad guitar for the Adafruit Circuit Playground Express
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README.md
chord-A.wav
chord-C.wav
chord-D.wav
chord-E.wav
chord-Em.wav
chord-F.wav
chord-G.wav
main.py

README.md

cpx_chord_guitar

Simple 7-chord touch-pad guitar for the Adafruit Circuit Playground Express (“CPX”). Plays C, D, E, F, G and A major chords, plus Emin. Enough for traditional 3-chord (Ⅰ, Ⅳ, Ⅴ) songs in the keys of C, D and G.

Directions

Upload all the chord WAV files + main.py to your CPX. Play a chord by touching a pad:

PAD       CHORD
========  ========  
 A1        C
 A2        D
 A3        E
 A4        Emin
 A5        F
 A6        G
 A7        A

Synthesizing chords

The chords were made with SoX and this script:

cat guitar.txt | while read chord foo first third fifth
do
  echo "$chord" :
  sox -n -r 16000 -b 16 "chord-${chord}.wav" synth 1 pl "$first" pl "$third" pl "$fifth" delay 0 .05 .1 remix - fade p 0 1 0.5 norm -5 reverb
done

along with this file, guitar.txt:

G   :  G2  B2  D3
C   :  C3  E3  G4
D   :  D3  F#4 A3
F   :  F3  A3  C4
A   :  A3  C#4 E4
E   :  E2  G#3 B3
Em  :  E2  G3  B3

You probably won't need to remake the chords. If you do, remember that the CPX can only play 16-bit mono 16 kHz WAV files.