iOS 11 should be arriving this month, which means all of 32-bit apps will no longer be usable if you upgrade. Fortunately classic app Bebot - Robot Synth was updated today with 64-bit compatibility!
What's new in Bebot - Robot Synth v2.1.1:- 64-bit compatibility
- Audiobus 3 support
- Bug fixes and minor improvements
Doug Woods from thesoundtestroom did a demo to celebrate the update!