modem . xmms . full duplex .tms drivers

Hi,

1>I have problem configuring my internal modem "motorola SM56 PCI speakerphone modem" .Though the modem works fine in "COM2" as in win98 , the same fails when given as "/dev/ttys0 or /dev/ttys1 or /dev/ttys2" for "/dev/modem" . I have tried in wvdial and kppd ,the error is "modem is busy" or "modem is not responding"
2>Whenever i try to play mp3 files in xmms , it plays for about 30 secs and the xwindows hangs till i kill it from another console.I have got cmpci soundcard for c-media electronics.
3>Are there any drivers for the above sound card for full duplex operation
4>Can anyone point me the url where i can find drivers in linux6.2 for TMS320C50

I would be greatful for any help in this regard
Regards
Madan A S

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