You could have downloaded Access Virus Loop Collection for GarageBand 1.0 for Mac from our application library for free. The application belongs to Audio & Video Tools.
From the developer:
GarageBand Loop Collection contains authentic sound textures from silky pads to evil arpeggiator lines - 46MB worth.
You may want to check out more software for Mac, such as MIDI Guitar For Garageband or Loops, which might be related to Access Virus Loop Collection for GarageBand.
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Antivirus