Answer

Yes. You can use older IOS mobile devices running an older IOS builds with the Touchmix-30 Pro Control App version 3.0.22 as long as the app is visible in the Apple Store on your device.  The Touchmix-30 Pro Control App version 3.0.22 was built for best compatibility with iOS17 or later.  If utilizing an older device and older IOS version, the quality of your user-experience on the Touchmix-30 Pro app may vary.  It may be necessary to contact Apple support to verify compatibility of your specific device with  IOS17 if the device is unable to update to the latest IOS build. If the using an older IOS device and no longer see the TouchMix Control App in the Apple store, the IOS device is then unable to run the app efficiently and is no longer supported.