*** ATTENTION! ***1. Tenor Trombone is a *SOUND PLUGIN* for another app called Functional Ear Trainer. Its not a stand-alone application!!! Install FET first.2. Moreover you need to have an in-app purchase "Sound Plugins" to enable them.To activate Tenor Trombone:0. Install it.1. Run Functional Ear Trainer.2. Click on the "gear" icon in the Main Menu.3. Choose "Tenor Trombone" under the "Sounds" setting.🎶 Enjoy! :)