MusicExtend is a powerful, registration-free, browser-based suite of AI tools for creators. Extend short clips into longer, seamless music while preserving style and quality; generate original lyrics or rap verses; craft mashups in seconds; and build (or download) royalty-free sound effects. The platform also includes background music and reverb removal for cleaner speech, plus one-click social audio converters for Instagram, TikTok, and YouTube. Everything runs online—fast, simple, and mobile-friendly.

This works well. I wonder if the Udio, Suno, et al 'extend' options work the same way?