[ Robbie remarked in 210520 MMDigest:
 [
 [ > Debierre's pipes are not a polyphonic instrument like a guitar.
 [ > They are monophonus, because they play only one note at a time,
 [ > like a flute.

Here you have detailed pictures of a polyphonic Debierre's multi-tonal
organ pipe...

Regards from south of France,
Philippe Crasse

 [   Full picture of a Debierre's multi-tonal organ pipe
 [ https://www.mmdigest.com/Attachments/21/05/26/210526_074335_Debierre_C_C'_D%20(1).jpg
 
 [   Mouth of a Debierre's multi-tonal organ pipe
 [ https://www.mmdigest.com/Attachments/21/05/26/210526_074335_Debierre_C_C'_D%20(4).jpg
 
 [   Foot of a Debierre's multi-tonal organ pipe
 [ https://www.mmdigest.com/Attachments/21/05/26/210526_074335_Debierre_C_C'_D%20(3).jpg