Noise after compressing to .caf with IMA4?

First time app developer here... please be gentle...
When compressing audio from .wav to .caf using IMA4, we're getting some noise introduced into the audio. Not a crazy amount, but noticeable. Is this normal? I realize it's compressing the audio 4x, but just want to make sure this is correct and that we're not doing something wrong.
Thanks for any help!!

How much is 'some' in your country?
All I could find was the following, from the T. Edison analog audio archive specs:
• none ( + )
• a little ( +/- )
• some ( -/+ )
• yep, no question about it ( -/- )
• what did you do, Thomas??? ( - )
This is 2009....'digital' noise is unusual, even w/the amount of compression you are embracing - no reason to have 'any'. If you do, 'some' people will ask 'why', thus distracting from whatever the purpose of the app is, so it may be best to have 'none'
Is your target audio music, voice, silence, or white noise?

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Noise after compressing to .caf with IMA4?

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