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Correct.

I personally define the read/write NBT myself in ICapabilitySerializable, as I find it more flexible (have more control over how stuff is stored, as well as being able to store types such as int array). This would force you to manage string keys though. However it is really up to you. I would suggest adhering to the single responsibility principle and make sure that your capability class is meant for data storage only; this will make it easier to debug as well as more readable.

I found the solution, you need a music in MONO not in STEREO ... @kaydogz