EXS24

EXS24 is a software sampler instrument that has been part of Logic Pro and related Apple software since the Emagic era. It is used to play back audio samples and to construct multi-sampled instruments by mapping samples across keyboard ranges, velocity layers, and other zones. EXS24 provides a practical environment for creating drum maps, instrument libraries, and sound designs that rely on sampled material rather than synthesized tones alone.

Core features include multi-sampling and key-zone mapping, which allow different samples to be assigned to specific pitch ranges and velocities. It offers envelope and filter controls for shaping dynamics and tone, as well as basic modulation options such as LFOs. Samples are typically loaded as standard audio files (for example WAV or AIFF) and are organized within instrument patches that reference these samples and define how they are played back. EXS24 patches can include root notes, tuning adjustments, loop points, and playback parameters that affect how the sample is triggered and sustained.

File formats and libraries involve the EXS instrument format for patches and external audio files stored on disk. Users can import their own samples to build custom instruments or load existing EXS libraries that accompany Logic Pro. The format is widely compatible with projects created in earlier versions of Logic and Pro Tools workflows that support EXS-based patches.

Current status and legacy context: In newer versions of Logic Pro, Apple introduced a modern sampler called Sampler as a replacement for EXS24, with improved workflow and capabilities. EXS24 remains available for compatibility with older projects and libraries, and many users continue to rely on it for established workflows and legacy sample libraries.