How do I restore the "AirHorn Anthem Lead" in GarageBand?

Redownload Sound Packs (most common solution)

On Mac (GarageBand 10.x+):

1. Open GarageBand
2. Click GarageBand (menu bar) → Sound Library
3. Choose Download All Available Sounds
4. or
5. Browse Sound Packs and install:

• • Electronic Drum Kit Pack
  • Hip Hop Sound Pack
  • Producer Packs (especially “Jahaan Sweet” or “Take a Daytrip”)

On iPad / iPhone (GarageBand iOS):

1. Open GarageBand
2. Tap Loops Browser (loop icon)
3. Tap Sound Library
4. Scroll through and download packs containing:

• • Synth Leads
  • Sound Effects
  • Hip-Hop Producer Pack

After downloading, the patch should return in:

Library → Synthesizer → Lead → AirHorn Anthem Lead