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Thank you for your feedback. I will consider your suggestions for next updates. And by the way, I'm interested in listening to the audio you created from paintmusic if you would like to share the file or mabe url.(If you don't want to, never mind~)

I'm sorry to tell you that you cannot just convert the json file into a format that you can use as an audio. Instead, you could capture the video of yourself playing in the game with the Quest headset's video capture feature, and extract the audio from the video or use the whole video itself. Hope this can help your request :) 

I saw the this question on my youtube video, and replied there. Below is the answer :)

Hello, Thanks for playing PaintMusic! Once you connect your quest 2 headset to your computer, you can access your saved files in the path "[QuestDevice]\Android\data\com.lefthanddeveloper.PaintMusic\files\Saves." A save file is in .json format FYI.