My email doesn't exist? I don't understand how you got an error like that. Anyway, I got hold of the extension from somebody else, and it doesn't work. In fact, I can source the internal modem to play sounds while it dials, but I can only capture them using SimpleSound (it doesn't play them as it dials). Is the internal modem sound extension just for GV modems, because I have an Apple Personal 28.8 internal modem. Is there also any other way to set sound to play through the speaker? This is Mac OS 8.1. Monitors & Sound doesn't have any 'playthrough' option, and with the old sound cp, the playthrough button is dimmed (but checked). The modem plays through either Internal CD or Internal AV. However playing an audio CD through that option works fine.
I might try OS 9.1 because it has a much better sound control panel.