may be better than sigmund~ or fiddle~ for detecting pitch

wget https://forum.puredata.info/uploads/files/1571510401254-helmholtz.zip (link from https://forum.puredata.info/topic/12358/helmholtz-compiling-for-windows-64/4)

the compiled version for linux is for 32 bit so it needs to be recompiled. A simple make in the src directory uses pd-lib-builder to build

after make there will be two .pd_linux files which need to be combined: g++ -static-libgcc -static-libstdc++ -shared -W -o helmholtz~.pd_linux helmholtz~.o Helmholtz.o

https://forum.pdpatchrepo.info/topic/5975/helmholtz-guess-what-it-is