Here is a list of all documented files with brief descriptions:

[detail level 123]

include
vt
tonegen.h	Voicetronix programmable tone generator API
src
libvpb
apifunc.h	Common internal helper functions
playrec.h	Internal functions for audio playback and recording
vpbapi.h	Voicetronix voice processing board public API
vpbreg.h	VPB hardware registry implementation
vt_deprecated.h	Deprecated symbol handling
vtcore.h	`VTCore` `HostDSP` implementation