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Preloading Patches with Internal MIDI Synthesizers

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Some internal MIDI synthesizer devices cannot keep all of their patches loaded simultaneously. These devices must preload their patch data.

Windows provides the following functions to request that a synthesizer preload and cache specified patches.

Value Meaning
midiOutCachePatches Requests that an internal MIDI synthesizer device preload and cache specified melodic patches.
midiOutCacheDrumPatches Requests that an internal MIDI synthesizer device preload and cache specified key-based percussion patches.

For information on how to determine if a particular device supports preloading patches, see Querying MIDI Output Devices.