How do I measure the real-time amplitude of a sound file (I'm using readsf~) from beginning to end, and then take a snapshot when it reaches 30 seconds and 60 seconds?

I'm not proficient in PD or audio (clearly); this is for use in an electronics project.

Help, please and thank you!

I've got env~ outputting a very short range (about 70-80). Is there a scale object that I can set to be 0 -100?
Also, does PD support 'If' statements?

nevermind, I found [range] and also [limit].

bah. I'm giving up on measuring amplitude.
I dont really know what I'm measuring now. I'm just outputting to some LEDs to get some action on them.
If anyone can look at this and help me modify it a bit I would be forever grateful. I'm looking to do the following:

a) send 'HIGH' msg to Arduino pins 3, 5, at the beginning of sound playback.
send 'HIGH' msg to Arduino pin 6 at the 30 second point of sound playback.
c) send 'HIGH' msg to Arduino pin 10,11 at the 60 second point of sound playback.
d) Turn all pins 'LOW' as soon as the audio stops.

Not sure how to find these markers in the sound file or without writing enormously huge numbers in milliseconds.
or maybe its 30 x 44100? Thinking out loud here.
bah.
BAH!

http://www.pdpatchrepo.info/hurleur/media2.pd

you can add an argument to env~ to change the buffer duration. right click on an env~ object to check the help file.