Knowpitch needs to know if you're singing quietly, powerfully, or somewhere in-between.
This is the magic in KnowPitch. Most users will prefer strong or medium. To disable pitch accentuation, select none.
For KnowPitch to work correctly, you may need to turn off battery optimization. The method for doing this vary between devices, but as a general guide:
Open Settings. This is usually a small gear icon found in the top right corner of the pull-down menu of your phone.
Under Settings, select "Battery"
There may be an option called "Battery Saving" or "Battery Optimization"; select this option and turn this feature off.
Some phones allow you to turn off battery optimization for specific apps. This option may be called "Power Saving Exclusions" or "Whitelist"; in this case, scroll to KnowPitch on your app list and turn off battery optimization.
For more information on keeping your phone from killing certain apps, see here: https://www.geekdashboard.com/stop-android-killing-apps-background