Greg,

> I'm after a SIMPLE LAN based chat software that will run on OS 9 & OS X, the
> simpler the better. (G4 is an audio workstation & I would like the chat to
> not interfere with the delicate extensions balance)

I've just written something that does this. It is similar to QuickConference
(CE software), but does not require a server. It works fine, but won't be
finished for a couple of weeks (I need to add preferences, and a couple of
things).

It shouldn't interfere with anything else that you are running. It does not
use extensions. The "chatting" is done via UDP.

> Something that has a sound alert for messages would be tops!

This program can play a sound, and bring itself to the front when it
receives a message.

If you can wait, and are interested in playing around with it, let me know
off list. If not, then I can recommend QuickConference for local private
networks. We've used it at our office for a couple of years. You just type
your message and hit the enter key.

Ta,

Andrew