First, go to Fallout3/data and open the "Fallout - MenuVoices" archive. Find MaleGenericGhoul in the list, and extract all the files.

Find the files you extracted.

The following .ogg files can be deleted, along with any associated .lip files:

followers_followershired_000370b2_1
followers_followersppurity_00070fb0_1
followers_followerstactics_0004082b_1
followers_followerstactics_0004082b_1
followers_followerstactics_0004082c_1
followers_followerstactics_0004082c_1

The first file here relates to Ahzrukhal from Fallout 3, the second to Project Purity, and the remaining files were never used.


Then open "Fallout - Voices" and once again find MaleGenericGhoul, this time just extracting the following files (both .ogg and .lip):

Greeting_00062726
Goodbye_0004bdb8
Goodbye_000a53e5
Goodbye_000a53f4
Hello_0006e8e8
IdleChatter_00089552
IdleChatter_00089553
IdleChatter_00089554
IdleChatter_00089555
IdleChatter_00089556
IdleChatter_00089557

If you find it easier you can extract everything from MaleGenericGhoul as before and then delete everything but these files (remember you want both the .ogg and the .lip.


Next, open your New Vegas directory and go to data/sound/voice/charon.esp/malegenericghoul. This is where the renamed files will go.

The files will all be named something like: followers_followers****_********_1.
For ease of reading I have left out these parts of the filenames leaving only the identifying parts, as it is only the numbers which need to be changed.

For example, "followers_followersFired_0003710a_1" is written below as "Fired_0003710a". Written after each is the new ID number.

The quickest and easiest way I found was to pick each pair of extracted files (voice and lip), move them to the new folder then rename as a pair.

So you would begin by locating: followers_followersFired_0003710a_1.ogg
and followers_followersFired_0003710a_1.lip

and rename them both to: followers_followersFired_00001947_1.

Continue to move and re-number the rest of the files, both .ogg and .lip, according to this list:

TOPICS;

Fired_0003710a - 00001947

FiredNo_000bd050 - 00001948

FiredYe_000bd049 - 00001949

Hired_0007fc23 - 0000194a

LetsGo_000370e6 - 0000194b

LestGoN_000370de - 0000194d

LestGoN_00037107 - 0000194c

Tactics_000370ef - 0000194E

Tactics_000370c5 - 000027ac

Tactics_000370b5 - 000027ab

Tactics_000370d8 - 000027ad

Tactics_00040830 - 000027ae

Tactics_00040831 - 000027af

Tactics_00040828 - 000027b0

Tactics_00040829 - 000027b1

Tactics_000370c7 - 000027b2

Tactics_00040810 - 000027b3

Tactics_00040811 - 000027b4

Tactics_000370d0 - 000027b5

Tactics_00037109 - 000027b6

Tactics_0004081b - 000027b7

Tactics_0004081c - 000027b8

Tactics_000370f5 - 000027b9

Trade_000370c3 - 00001669

Wait_000370d7 - 00001668


Greetings;

Greeting_00062726 - 00002a97

Greeting_0007fe02 - 00002a98

Greeting_00089462 - 00002a99

Greeting_00037130 - 00002a9a

Greeting_00037131 - 00002a9b

Greeting_000302ec - 0000194f


Goodbye;

Goodbye_0004bdb8 - 00002a9c

Goodbye_000a53e5 - 00002a9d

Goodbye_000a53f4 - 0000361b


Hello;

Hello_0006e8e8 - 00002a9e

Idle;

IdleChatter_00089552 - 00002aa0

IdleChatter_00089553 - 00002aa1

IdleChatter_00089554 - 00002aa2

IdleChatter_00089555 - 00002aa3

IdleChatter_00089556 - 00002aa4

IdleChatter_00089557 - 00002aa5


So, thats a total of 41 files renamed. You should now have a fully voiced Charon.
Combat and other generic speech is handled by the games existing MaleGenericGhoul files, hopefully this will blend in reasonably well.