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If you have music in midi format it is straightforward - just replace samples with your chip tune samples. Unfortunately there is no simple way to do this at raw wav level.
Your best bet will be to run your source material through a bitcrusher and a sample-rate reducer. However, that will just make it sound like the kind of low-quality samples that could be played back on old machines. Actual chiptune music tends to involve very careful use of low-resolution waveforms and FM synthesis.
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