See the link I gave. That’s Apple support website, iirc.
iOS 15 or later
You can use Voice Isolation and Wide Spectrum on these devices:
- iPhone XR, iPhone XS models, and later
- iPad (8th generation) and later
- All iPad Pro 11-inch models
- iPad Pro 12.9-inch (3rd generation) and later
- iPad Air (3rd generation) and later
- iPad mini (5th generation) and later
Hope this clarifies the options.
WH