I recently switched back to Trumpet from French Horn, and I have a very good ear when it comes to tone. I think this is a great app for improving your tone, but I solely feel the sound of the tone is a bit annoying and if possible an option for the instrument making the tone could be implemented. I dont know if I think this because Im a trumpet player or if Im selfish but this is my opinion. I hope you take my suggestions into consideration, thank you.