The app goes silent on Ipad

Could you please fix the bug that is causing the app to go silent? I istalled the app QuizTones and ever since then hooktheory is silent, and the Ipad is not muted. Restarting wont help. It happened to me before and I had to restore the factory settings on the Ipad and re-install everything to get hooktheory working again, and now it seems I have to do it again, so annoying! Thank you!

Very strange. I’m assuming this happens even if you quit the apps and/or restart your iPad?