Interface/operation a little confusing

First, as another reviewer stated, the interface sometimes disappears, but there is a little tuning fork in the Mac menu bar to get it back. This happens when you go to preferences.

Go to preferences by the little gear icon, screen will disappear when leave Preferences, see above. You also quit this way.

Could use a manual, help selection, at least a read me file.

Some of the screen shots shown are for the paid version. I think to get anything out of this app, to easily tune your guitar, you need to get the paid version.

phillman5 about insTuner - Chromatic Tuner for Guitar, Ukulele and String Instruments