@willblackhurst you changed the question so now my response looks weird. the electronic music pd site has a pitch shifter. http://www.pd-tutorial.com/english/index.html

"moon-lib" has a tabread inbetween-er. the bazier formulas are available in pd vanilla somewhere. P1 P2 foci fomulas. one of them is in "context"-lib

the auto-builder thing puts abstarctions into a subpatch. and it will clear the pd box/ subpatch. this is where I usually look. but they have a few links on this site as well.
http://www.pd-tutorial.com/english/ch05.html#id436992

these files use abstraction placements and clear them.
https://patchstorage.com/adjustable-slope-objects-pd-vanilla-gem-pmpd/
https://patchstorage.com/pd-gem-line-drawing-program/

oh the phasor thinks the period is only the middle copy length. and it starts at the middle copy. so it should go backwards as well.

tabosc4 has a length constraint so this is probably better for samplers etc.
https://patchstorage.com/no-click-phasor-looping-w-tabread-pd-vanilla/

you dont have to loop the sample. why cant you just end the note? you could drop the volume to zero. or you would just stop the player and reset it to zero and wait.

you can put the wav file into an array. and then look through the list of numbers. so at that point you only need to come up with regular math processes that might find what you want. the wav file will probably be half positive numbers and half negetive numbers. so you might end up only looking at the positive numbers. then you might check the list in groups of points - 1-100, 2 -101 3 through 104 etc etc and then get a score after doing a process looking for the highest number per batch. then you look at the score list. and you might find that you can get the high points by adjusting your group / batch cropper.

you can look through the wav and you can find the highest and lowest numbers. but you might want it from an average of 100 point length. so you could check the wav in batches of 100 or 1000 point groups and look for average hights. etc etc

you need to watch the videos and read the help files.

this guy has a bunch of good videos on youtube.