a pipeline with appsrc doesn't sound right

[bb]

Hi,

So i have an audio pipeline appsrc -> rawaudioparse -> autoaudiosink.
The appsrc element is being fed buffers with raw audio samples (S16LE)
from a text-to-speech application.  The 'rawaudioparse' element is
configured for PCM, 22050 rate, mono audio.  I'm getting some audio on
the speakers but it sounds "sped up", as if the timing is not right. On
the other hand, the WAV file that text-to-speech application can save
sounds normal, so it appears the pipeline is misconfigured.

As my knowledge of GStreamer is rather superficial I'm looking for some
pointers what to change in order to get this working properly.

--
Cheers