[Discuss-gnuradio] Wav File Source and Audio Sink

[postmaster]

Hi all,

I am little bit puzzled by a simple flowgraph.
I have prepared a wav file using following graph: Signal Source (float, 
sine, 1khz freq, sample rate 8000) -> Throttle ->  Wav File Sink (sample 
rate 8000, 8 bit per sym).

Then i created graph for listening: Wav file source -> Audio Sink 
(sample rate 8000) + FFT Sink.
And then i ran this flowgraph, i faced with following problem: I don't 
hear anything from audio sink.

FFT sink shows me that data is coming, 1 khz peak is present on FFT, but 
i can't hear it.

Could somebody explain this strange behaviour.

Best regards,
Igor