There's a modem speaker slider to move to the 'off' end, via either Control Panel-Modems-properties-General tab-properties, or My computer-dial-up networking-General tab, configure (in Win 98SE, anyway). I have an idea I had to do something else too, to stop the modem screeching, but can't remember what it was. Maybe there was a modem volume control via the speaker icon, that wasn't enough by itself. (in which case it diappeared after doing the above). There's a recent post about wanting to regain lost dialup sound! I don't know what it does for anyone.