Guide on modding audio using my own tool, PD3AudioModder

Replacing music can be trickier, as it usually has to be the same length as the original. Custom Heist Track Tutorial/Guide may be better. Some enemy voicelines may also not be replaced well. See ZeroZM's Guide to Enemy voice replacement. Heister voiceline replacements worked fine for me.

This guide assumes you know some basic Windows knowledge like extracting .zip files and using command prompt.

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PD3AudioModder handles all this for you:

• Converting audio to WAV + little endian
• Editing the HEX data of .uexp files
• Packing files
• Viewing, playing and exporting sound files as uasset, ubulk, uexp/wav

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older guide available here that uses Wwise and some scripts for those interested.

payday 3 modding is... less painful..