Only plays music on your device

Does not work if you use music in the cloud like Apple Music, Spotify, Internet radio.

Therefore, not usable for me and probably many.

There should also be an option that makes the sound change system wide, meaning an option where one can chose to have the frequency filtered out for phone conversations, videos, games, etc., so one has the effect not only with sounds consumed through the app.

Volker Lauterbach about Tinnitus Pro : Music Therapy, v1.2.2