A properly used compressor should help a bit with increasing the volume of quiet sounds like footsteps. However, I doubt it would help much regarding where
the sounds are coming from, which I'd imagine is also important.
For this, I'd recommend getting quality headphones (if you don't already have a pair). Personally, I love the AKG K702
's. From a musical standpoint, they really do a great job in showing where each instrument is relative to the stereo field, as well as how loudly they're playing.
There are some instances with certain songs I've listened to my whole life before getting the K702
s, where after listening with the cans, I discover new instruments that I never heard before! So it might help distinguish where footsteps are coming from and how far they are.
s are too hefty of an investment (which would be understandable), I'd recommend the Audio-Technica M40x or M50x. The M40x's usually around $99 new, but during black friday they were available for around $65, so maybe you can find them on sale with the holidays coming up.
Also, our french readers provided their favorite studio headphones under $150
, so take a look at the list (you don't need to speak french) and look for the best deal in any of these headphones and you likely won't be disappointed
Anyway, let us know how that compressor does, and good luck getting the bad guys!