Hello,
I’m new on Scaler 2.
I tried record with the mic but it doesn’t always recognize the notes properly.
I know it would work with an external midi keyboard.
I would like to be able to detect a scale with the piano keyboard of the app.
Welcome to the community @cellicello
The keyboard does respond, just hit record in Detect mode with MIDI as the source and then click the keys on the Scaler keyboard :
Thank you very much. 
I don’t know why my iPad don’t react immediatly with the internal piano but it works.!