Can I deal with the audio stream while recording?How?

Hi, All,
I am doing a project about SIP phone using J2ME. I am quite new to this area. I want to mask the audio stream before it sends out. I want to know if it can be achieved in J2Me. if yes, would you give me some reference? Thanks for any reply.

Is anyone who knows how to achieve this？

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    I recently got a bass guitar (fender p-bass) and its
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