Tone setting changes the pitch of the sound as low or high since some people hear better with different frequencies. With work in background feature it can work in background when your phone is locked. There may be latency with airPods and when tone setting is not in the middle, we recommend wired headphones for the best performance. Second screen is for recording. You can record any sound and share using common applications. Free version runs with time limits and ads. You can remove those limits and ads by in-app purchases. There is NO SUBSCRIPTION, which will renew again. Payment is just for ONCE and for the LIFE-TIME. Enjoy
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