I've recently made a small sound mod for Comanche Gold and it's now available for download at my site:
http://digitality.comyr.com/flyboy/cg/cg-snd-mod.zip

It adds a new rotor/engine sound for the Comanche (player and wingman) so that it's more realistic. Please see the included readme for details and instructions.

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Here is a list of sounds in the CGOLD.PFF file that I tried and tested while making my mod, it may be useful for potential sound modders.

Note that I used "FwO Raven's Pff Utility V0.7" to open the game PFF files.

* ALERT.WAV - Air raid siren
* BEEP2.WAV - New message alert
* CANNON.WAV - Gun
* COMANCHE.WAV - External rotor/engine
* EXPLODE.WAV - Explosion on ground
* HITBYMIS.WAV - Hit by missile
* INSIDE.WAV - In-cockpit rotor/engine
* INTROL.WAV - Start of menu music (left channel)
* INTROR.WAV - Start of menu music (right channel)
* LOOPL.WAV - Continuation of menu music (left channel)
* LOOPR.WAV - Continuation of menu music (right channel)
* MISSILE.WAV - Missile in-flight?
* MOO.WAV - Cow moo
* OCV002.WAV - Betty "cannon"
* OCV005.WAV - Betty "gear"
* OCV006.WAV - Betty "targeting systems"
* OCV009.WAV - Betty "fantail"
* OCV010.WAV - Betty "main rotor"
* OCV011.WAV - Betty "engines"
* OCV017.WAV - Betty "gear is down"
* OCV035.WAV - Betty "failure"
* OCV038.WAV - Betty "warning, blade stall, slow down"
* OCV099.WAV - Betty "damaged"
* SCRAPE.WAV - Rotors hit object/tree
* WARNLOCK.WAV - Threat locked on
* WARNTORQ.WAV - Over-torque warning

I also wanted to change the retractable landing gear and bay door sounds, but for some strange reason they are in this 'KDA' format, which is not openable or editable in any program I've tried. I don't know what the 'ROTOR.KDA' or 'THUNK.KDA' sounds are, if they are indeed even sounds.

* DOOR.KDA
* GEAR.KDA
* ROTOR.KDA
* THUNK.KDA