downsample

Actually the connection like this : source(wav file)--->low pass filter---->buffer----->downsample------>unbuffer------>sink but the output sound have noise so my lecturer want me to move out the buffer and replace another simulink block in order achieve the chipmunk sound effect but i unsure which one is correct.
Which simulink block can use to fade while i m waiting for teh next round of sample?
Thx a lot for replying...^^

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2012-6-23

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