Vobnr

I’m using an iPhone 12 pro, and the app has not been working properly. It sometimes responds better to pitches from C5 and up, but anything lower than that it gets stuck or doesn’t respond. I’ve tried downloading the app several times, I’ve changed my case to make there was no obstruction to the microphone, but the problem is still there. Is there a fix for this, otherwise I’ll to use another app. Cleartune used to work very well and was indispensable when it came to baroque temperaments.