You. Period. It’s your data. You do what you want with it, but just make sure that you are not legally restricted from using the music that you’d like to provide Helios.
Note that DSP metadata in this context is not embedded inside of each song file, but exists separately within your Helios database. This metadata describes how each song actually sounded.
Embedded metadata on the other hand refers to the usual song data like artist, title, album, cover art, and so forth. It is normally stored inside of each song file.
