Various sounds are enhanced and certain quieter sounds are made louder for suspense reasons.
Here is what I did for now :
gun_far 1,2,3,4 - these are sounds heard in questionable ethics, but originally they
are barely hearable. In fact I didn't hear them at all ! So now I changed them and made
them louder so you can hear soldiers killing scientists in QE corridors.
scream_far 1,2,3 - another sounds from Questionable Ethics. They are also heard in
corridors. I made them louder so they should be heard now clearly.
soundscape_boom 1,2 - It's the best in this pack. It's ambient of outside battles in
"surface tension" chapter. Originally they are one second quiet boom. I changed them
into gunshots, explosions etc.
soundscape_indoorboom1,2,3,4,5,6,7 - Quiet explosions heard in game. Now they are loud
so you can feel impact of levels such as forget about freeman.
alarms - changed few of them
vo(c1a1b,c1a2a) - here are suspense sounds I added. They are mixed with npc dialogue but
in scenes when you don't see their poses so faceposer is not messed up.
weapons - I changed sound effects of three weapons.
EDIT : V2 changes
alien grunt step1,2,3,4,5 etc. - When alien grunt walks, he wears armor on his feet. Now you can hear metalic footsteps from it !
apache and osprey rotors - changed the sound effect of it
mscl_ambience - changed one into suspense from hl1 when you meet first alien grunt in QE like it was in HL1.
comeincooper and faf radio - now you can hear battle sound effects in the background
EDIT : V3 changes
new suspense in apprehension when a guard is killed by assassin like it was in original HL 1
houndeye;blast1 - It's the same sound from original BMS but with sonic damage effect at the end
tentacle;tent_strike1g - I changed tentacle sound when it strike metal parts of floor
scream_far 1,2,3 - increased volume because they were not heard very well. Now they are.
soundscape_farchopper1,2 - increased volume because I didn't hear them in game
mp5_shot,burst,single - increased volume
soundscaoe_gunfire1 - increased volume