@Natan We are already talking about AudioFiles that are used in the AudioPool and in the AudioLoopPlayer.
if so:
You can also save it as mp3 with 200kb - as soon as you load it into the AudioPool it has 6MB.
I guess your .FLac conversion reduces the sample rate of the file - as you can see from my experiment, when you reduce the sample rate you reduce the size in HISE.
What is the sample rate of your original .wav and how much is the .flac file?