[PD] interpolating between 2 streams

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> Hi list, one question: i have 2 abstractions that are generating
> streams of data, ,how can i interpolate between this 2 streams? for
> example when my slider is the left then  the output is stream "a" and
> when my slider moves to the right it gradually convert into stream "b"
> .  Is there is an easy way for doing this?
> 
> thanks
> 
> R.