FreeMIDI was a popular virtual studio management application by Mark of the Unicorn (MOTU) for the Classic Mac OS. It was used to mimic the physical setup of MIDI devices that are connected to the computer and provide applications and the Mac OS a way for referencing them.
OMS by Opcode also performed similar duties. Some MIDI interfaces provided drivers for both FreeMIDI and OMS, while some only included drivers for one or the other. FreeMIDI included an OMS Compatibility Mode which allowed FreeMIDI to communicate with devices in OMS.
Under macOS, neither FreeMIDI or OMS are used, as those duties are covered by macOS's included Audio MIDI Setup utility.
For those who still have or use Macs that can only run Classic Mac OS, OMS still exists in select music app archives online.
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A sound card is an internal expansion card that provides input and output of audio signals to and from a computer under control of computer programs. The term sound card is also applied to external audio interfaces used for professional audio applications.
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Virtual Studio Technology (VST) is an audio plug-in software interface that integrates software synthesizers and effects units into digital audio workstations. VST and similar technologies use digital signal processing to simulate traditional recording studio hardware in software. Thousands of plugins exist, both commercial and freeware, and many audio applications support VST under license from its creator, Steinberg.
GarageBand is a line of digital audio workstations for macOS, iPadOS, and iOS devices that allows users to create music or podcasts. GarageBand is developed and sold by Apple for macOS, and is part of the iLife software suite, along with iMovie and iDVD. Its music and podcast creation system enables users to create multiple tracks with pre-made MIDI keyboards, pre-made loops, an array of various instrumental effects, and voice recordings.
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Open Music System (OMS) was a virtual studio management application by Opcode for the Classic Mac OS. Similar to FreeMIDI by Mark of the Unicorn and Audio MIDI Setup by Apple, OMS used a GUI to manage MIDI devices by providing DAW applications and the Mac OS with information regarding the physical setup of MIDI devices connected to the computer.
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The following outline is provided as an overview of and topical guide to Apple Inc.:
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