Serial port data to audio on the fly
 

Sorry to bother, but i have the following problem. I'm trying to implement
AFSK modem 2400 baud rate, through serial port. That is serial flow is generated on the fly to AFSK signal in soundcard. I have dropouts. The question is how to make it smooth ? Is multithreaded proccess will help(one for read from serial port, one for streaming to sound card ) ?

Any suggestions are appreciated.

WBR, Andrei Buin.