@Butahuruf Fun problem. You might start with the condition as you've laid it out by using the [expr] object and establish your triggering range using a simple if x > y && x < y statement. The tricky part is to only trigger the audio sample once (using something like [readsf~] rather than a bunch of times, so you'll also need to account for that, maybe using a [spigot] object to gate your triggering event. [onebang] and [once] existed at some point, too.
The easy answer my be the [threshold] object if it's still kicking around but start by breaking the problem down into modular chunks and sketch and test each one. Good luck.
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