The digital lutherie toolkit you need.
LAM-lib is a toolkit for Max/MSP providing all kind of useful goodies you need when building digital music instrument with Max. I started it during my work at the Lutherie Acoustique Musique lab. It is distributed under LGPL licence so that you can check it, fork it, buy it, sell it, use it, break it, fix it, trash it…etc. Just credit it.
Get it from GitHub.