fix(sources): allot pitches to empty instruments

Lorenz Lehmann

10.12.23 8e1e114af6e32c52d82a9f3979dd8fca6281ae3a

 .gitignore

@@ -1,11 +1,10 @@
# MacOS Finder files
.DS_Store

# LispWorks files
*.*fasl
*.*~
*.lisp~
*.lisp#
*.*~
*.*#

# OM Reference files
/reference-pages/