Advanced
Under the Advanced tab you will find the individual settings, like a specifically
assigned voice. Normally, if speech is active each channel has a default voice,
and if no particular individual voice is assigned then the person will use the
channel default. If you do assign a voice then that is the one that will be used.
If you want to exclude this particular person from being spoken out, then you
can assign the voice "Do not speak"
If speech, or automatic DCC functions are turned off in the preferences then these
controls will be greyed out as in the picture.