Currently, the app has two independent volume systems, which can be adjusted as follows:
Adjusting lesson volume (Listen to Elsa reading samples, feedback): you can adjust the media volume of the device being used by increasing / decreasing directly on the device's hard keys. If the volume is at its maximum but you still don't hear clearly, use headphones to learn for the best results!
Adjusting sound effects volume: Go to PROFILE → LEARNING & SOUND SETTINGS → Adjust the Volume bar