Change audio playback speed while transmitting via RTP

Hi,
Basically I want to be able to change the speed/tempo of audio in real time (like you can on a turntable, for example) from a file stored locally. My program currently plays the audio on the local machine and transmits this same audio via a live RTP stream. I intend to include a slider on the GUI that changes the speed of the audio (like can be found on a turntable or DJing programs).
I am unsure if this would be possible, or how I would go about doing it. So far, I have found out the following:
The setRate() method of a Player should do what I want but it doesn't always work (the rate 1.0 is only required to be supported). I only require my program to work with WAV files, and setRate() only seems to support a rate of 1.0 with this file type.
One way of changing the speed is to change the sample rate (I don't care about pitch changes), but I don't think this can be done in real time with JMF. It is possible using a SourceDataLine or TargetDataLine with JavaSound; however, I believe I would firstly need to write code to feed data from a SourceDataLine to a TargetDataLine that an AudioInputStream can read from (as I don't think many systems, including mine, have a Mixer with both a SourceDataLine and TargetDataLine). If I did this, would I then need to do some processing to convert the sample rate of this AudioInputStream into the sample rate of the DataSources that are currently playing or transmitting data (I have a custom DataSource to go from AIS to DS, and so the read() method in this would possibly have to 'throw away' or duplicate samples to get the desired sample rate)? Would this solution be possible, or would there be a better solution?
Thanks

I have previously tried getting a FrameRateControl for a Player and a Processor, and I have just tried again, but the getControl() method always returns null. I have tried this with several WAV files. Is there any other way to change the sample rate in real time with JMF?
For Java Sound, I already have code that lets me convert from DS to AIS and from AIS to DS. The problem is that I am unsure how to increase the sample rate in real time without using a SDL or TDL. But I think, if the AIS is reading from a file, the DataSource would have to read faster, or slower, from the AIS, and then do something with the samples to match the actual sample rate being used by the Processor in JMF. I am not sure whether this is anywhere near the right approach though, and I'm not sure how I could get the effect of changing the speed of audio without changing the sample rate of the Processor.

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