Photosounder Archive v1.1

// Ensure that the top layer is selected
Selected layer -1
Selected layer +1

// Average dot to turn it into a line and multiply
Operation vertical average
Blending multiplication

// Copy original sound
Selected layer -1
Duplicate layer

// Put the two layers into a group
Selected layer -1
New separator "----"
Selected layer +2
New separator "----"

// Create the average spectrum of the selection
Selected layer -1
Merge down layer
Rename layer "Selected Spectrum"
Operation horizontal average
Operation normalisation

New layer "Sweeping Harmonics"
Draw white spray
Point size 0.078125 % x 0.400267 st
Units %,note
Point intensity 1
Harmonics 100
Lines
0	C1
100 	C7

Blending multiplication
Selected layer -1