Best tool to convert, recode, change bitrate of audio for the Playdate?

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Hi all.
My game is very sound effect intensive so I've run out of memory a couple of times already. I want to decrease the size of my wav files but each time I do so with the tools I have available (ffmpeg or Audacity) weird sound artifacts are added to the resulting files.

Do you have any preferred tool to convert, recode and change bitrate of audio files?
My main dev computer is Windows, but I have MAC and Linux computers available if a tool only works on one of those OS's.

Thanks in advance for any recommendation or help.

(BTW I know this is not strictly a SDK Help request, but I couldn't find a better category)

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adpcm-xq is a command line tool the uses advanced algorithms, large lookahead buffer, and brute force to get best in class results. I recommend lookahead option 5 or higher.

Also, I made a GUI front end for it (Mac-only) https://devforum.play.date/t/adpcm-encoder-tool-mac-only/1283/6

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Thanks Matt, I'll give it a try

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