reduce buffer during live conversion

dear all, im' trying to convert from a process wich send raw audio
data with this command:

#!/bin/sh
lame -r -s 4 /dev/fd/3 out.mp3

This script is working fine, but i'm experiencing a delay of 3-4 seconds.

Probably there is a buffer into lame that wait to have enough data to convert?

Is it possible to reduce this buffer?

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/*************/
nik600
http://www.kumbe.it