[Admins]

Here is what it says in newfeatures2002.txt which you find in your Graal folder:

- to enable the new voice chatting feature open the Graal options
and enable the microphone ('Audio' options)
to test the output speak into the microphone and
see the output level on the bar on the right side of the option
window;

there is also a rectangle which is red or green depending on
the voice level, that rectangle shows if the game has interpreted
the voice level as high enough to be sent to the other players;
it should only be green when you speak so its not sending data
all the time; by moving the slider you can change the voice
activation level, move it up when it's too often green, move it
down when you can't hear yourself anymore;

you can also activate the mircophone by hand if you don't want to
have it automatically send the voice when you speak; for that select
'Key' as the activation method and click on the rectangle right to
it if you want to change the key that activates the voice

in the game you automatically hear other people speaking when they are
close to you (16 tiles=256 pixels), set the voice volume to 0 in the
option window if you don't want to hear other people; you can mute
single players by right-clicking on a player in the player list and
selecting 'Mute', or in the game by right-clicking on the players
and enable the 'Mute check box in their profile

Graal automatically chooses the best voice encoding codec depending
on how many people are hearing you; if there are 1 or 2 people then
it uses GSM (mobile phone quality, 13 kbit), when there are 3-5 people
then LPC (4.8 kbit), when there are more than 5 people then it uses
LPC-10 (2.4 kbit). The quality of the voice depends on your microphone,
it should have something to filter wind, otherwise the lower quality
codecs have problems and make you sound like you are singing; in the
options window you can choose a different testing codecs to hear if your
microphone still works good with lower quality codecs