Pause/start AVAudioPlayer without glitchy pops?

Try sending the -prepareToPlay to your AVAudioPlayer object when it's paused. This will pre-load the sound.

Use one of the lower level APIs (Audio Queues or RemoteIO). Smoothly ramp a multiplication factor from 1.0 to 0.0 over some number of PCM samples. Use that factor for the sample-by-sample gain factor in your own DSP audio mixer.

Ramp from 0.0 to 1.0 on restart. Linear or an ease-in/ease-out half-cosine curve.

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