From the README...
The vgTcl Suite is a set of Tcl/Tk bindings, example scripts, and utilities for the Vega, AudioWorks2, and IRIS Performer APIs. Most functions available through the C APIs are available interactively at runtime. Applications no longer must be monolithic binaries of bounded capability; apps can be assembled at runtime of small interactive scripts, with capabilities added as needed.
The vgTcl Suite is an open-source "vgGift" from MultiGen-Paradigm Inc.
The vgTcl Suite consists of
/CDROM/vgtcl directory
If you do not have the CDROM, you may download
tcltk803.tardist (4.5MB) and
vgtcl34.tardist (4.3MB) from
ftp.paradigmsim.com/pub/outgoing/vggifts/vgtcl34irix/