llback.html">callback interface</A> which has the same 
		functionality as the interface above but allows the details of input and
		output to be separated.
		The output is generated by call a read function and the library calls a user
		supplied callback function to obtain its input.
		This interface is particularly well suited to applications where the output
		sample rate is varied with time.
</UL>

<P>
<b>NB :</b> All three access methods are able to process multi channel interleaved 
data.
</P>

<P>
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