*** ATTENTION! ***

1. Double Bass is a *SOUND PLUGIN* for another app called Functional Ear Trainer. It's 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 Double Bass:

0. Install it.
1. Run Functional Ear Trainer.
2. Click on the "gear" icon in the Main Menu.
3. Choose "Double Bass" under the "Sounds" setting.

🎶 Enjoy! :)