The missing on-screen display and remote.
System requirements: iPhone or iPad (iOS/iPadOS 13 or later) or Mac (macOS 11 Big Sur or later)
Supported models: NAD T 758 V3, NAD T 777 V3, NAD T 778, NAD M17 V2, NAD M15 HD (requires AM 17 and VM 300 upgrade), T 187 (requires AM 17 and VM 300 upgrade), T 787 (requires AM 230 and VM 300 upgrade).
For support please visit the FAQ / Help page or send a support request.