Helpful for beginner
I love this app. Very fun as a practice tool for a duet. I am a beginner so I like being able to easily see the key pattern to help get the song into my head and fingers. I had trouble with getting the sound to work at first but then realized I had my phone's mute button switched on. Silly mistake. Nice app.
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Not faithful to real concertina
Unfortunately, it is not possible to play this app like a concertina. Standard Maccann fingering involves playing two buttons simultaneously with a single finger regularly. This app does not support that, so it is impossible to use standard Maccann chord patterns on this app.
Response from developer
Sorry, but that's just not possible with touch screen technology.
Good but...
Just what I wanted but it would be better if it started at the lower C like a Wheatstone. The top octave offered is less often used except for calling dogs! An option for this would be good.

