Korg Soundlink DRS OASYS PCI User Manual page 122

Preferences
The OASYS PCI can appear as a MIDI device to OMS- and FreeMIDI-compatible
programs, or can be used directly via the Macintosh serial ports.
OMS. The OASYS PCI will use the Open Music System. Select this option for use
with Vision, Studio Vision Pro, Logic Audio, Cubase VST, Cakewalk Metro, and
other OMS-compatible applications.
FreeMIDI. The OASYS PCI will use FreeMIDI. Select this option for use with
Performer, Digital Performer, and other FreeMIDI-compatible applications.
Serial. The OASYS PCI will connect directly to one of the Macintosh serial ports.
Use the MIDI Port parameter, below, to select either the Modem port or the Printer
port, and use the Port Speed parameter to set the speed of the MIDI interface.
Editor Responds to OMS/FreeMIDI Controllers (MacOS)
On/Off. This parameter only applies when the MIDI System parameter, above, is
set to either OMS or FreeMIDI. It is similar in function to the "Local On/Off"
setting on many synthesizers.
If the box is checked, the OASYS PCI Editor will directly respond to MIDI
controllers (keyboards, MIDI guitars, wind controllers etc.). If an OMS or
FreeMIDI program is patching through MIDI input from the controller as well, this
will cause the OASYS PCI to play two notes for every one that you play–one
received directly, and the other received from the sequencer. This can cause
various strange results, including phasing, hung notes, and notes cutting off
prematurely.
If the box is not checked, the OASYS PCI Editor will not directly respond to OMS
or FreeMIDI controllers. Instead, it will only receive MIDI data patched through
from the sequencer or other MIDI program.
Editor Responds to MIDI from MIDI Input Device (Windows)
On/Off. This is similar in function to the "Local On/Off" setting on many
synthesizers.
If the box is checked, the OASYS PCI Editor will directly respond to MIDI
controllers (keyboards, MIDI guitars, wind controllers etc.). If a MIDI program is
patching through MIDI input from the controller as well, this will cause the
OASYS PCI to play two notes for every one that you play–one received directly,
and the other received from the sequencer. This can cause various strange results,
including phasing, hung notes, and notes cutting off prematurely.
If the box is not checked, the OASYS PCI Editor will not directly respond to MIDI
controllers. Instead, it will only receive MIDI data patched through from the
sequencer or other MIDI program.
Serial Ports (MacOS)
This parameter only applies when the MIDI System parameter, above, is set to
Serial.
Modem. The OASYS PCI will send and receive MIDI from the Modem port.
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Reference
OASYS PCI