IMA-ADPCM WAV audio files how to split into separate multiple files

IMA-ADPCM WAV audio files how to split into separate multiple files
I now split into several files , only the first one can be normal playback, several files play back the sound has noise,
Who can give me some tips , how to solve ah ?
help. . .
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key you how separated ah , only the data portion of the separator , and separated by an integer multiple of the median , and then head inside the file size changed a bit, the rest of the file header of each file a copies.
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header files you must modify the Size ?
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I did not modify the Size, files can also be played back , but each tone seems to have an irregular pulse.
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I have not tried this , I think the best way to modify , otherwise the file header information is wrong ah.
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I have not tried this , I think the best way to modify , otherwise the file header information is wrong ah.  

solve the problem , is to forget the original length of the header files are included, leads to the second file reads the wrong place ,