Change the playback sound

Swipe up the sheet at the bottom of the screen and tap on the icon highlighted below.

If you don't see it, you must scroll the list of icons horizontally.

You can adjust the volume of the instrument here:

Currently available sounds:

• Piano

• Acoustic guitar

• E-Bass

• Synth

• E-Piano

• Organ

The playback sound/instrument is global all over the app.