Set mode property for the grammar,
int SetMode(const char* mode)
mode
The interaction mode of the grammar.
grammar.SetLanguage("en-US");
grammar.SetMode("voice");
grammar.SetTagFormat("lumenvox/1.0");
Is the same as writing in your grammar:
language "en-US;
mode "voice";
tag-format <lumenvox/1.0>;
LVGrammar::GetMode
LVGrammar_SetMode (C API)
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