Next Sampler Instrument
Switch to the next Sampler Instrument. The Sampler is opaque to me. Some day I may pursue learning about sampling, and probably compare using Sampler or Alchemy for working with samples.
Load and save instruments in Sampler — Apple Support
A sampler instrument is the file type that is loaded into Sampler with the plug-in Settings pop-up menu. When you choose a sampler instrument, the associated audio files are automatically located on the hard disk (or disks) and are loaded into your computer’s RAM.