Added Steinway Model B Grand Piano sound.
Fixed crash when first opened for some non-English language users.
Added support Android Q (version 29).
Jazz Piano Interval Trainer tests your ability to recognize musical intervals on a piano keyboard in all 12 keys.
Choose a quiz, and then within the time limit, select the indicated numbered intervals
for the key highlighted.
For each interval/progression, the goal is to complete all the keys and get 100% accuracy.