Gestrument Pro was updated with new presets and a trial period for people to check it out. If you decide that you like it, there's a one-time purchase price of $19, or you can pay $1.50 monthly.
What's new in Gestrument Pro v1.2:• Sound adjustments needed after the iPadOS 13 update
• Trial period introduced – new users can now try the app for free
• Several new musical presets to play around with
• Various tweaks and fixes