The following shows a sample text-base dictionary for US English:
[Header]
[SubHeader]
Language = ENU
Content=EDCT_CONTENT_ORTHOGRAPHIC
Representation=EDCT_REPR_SZ_STRING
[Data]
DLL "Dynamic Link Library"
Hello "Welcome to the demonstration of the American English Text-to-Speech system.
TTS "Text To Speech."
info Information
[SubHeader]
Language = ENU
Content = EDCT_CONTENT_BROAD_NARROWS
Representation = EDCT_REPR_SZZ_STRING
[Data]
addr // '@.dR+Es
avaya // $.'v@.j$
The [Data] sections contain the abbreviations or phonetic expressions you want to add to your custom dictionary.