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If the channel is matched, the MIDI message continues through the zone. MIDI note messages are processed by many mas-
ter control functions, which may modify the note number, velocity, or perform other sophisticated processing. MIDI con-
troller messages may be passed unchanged, converted to a different controller message (mapped), or blocked completely.
The resulting MIDI message is then assigned a specific MIDI channel, delayed (programmable from zero to ten seconds), and
routed to one of the four MIDI outputs.
The zones are able to issue program change and controller initialization values (volume, modulation, etc.) at the instant a SL-
2001 preset is selected. These messages will be issued even if the ZONE switch is off. If the zone is activated later with a
footswitch, the sound module will already be set for the proper program and controller
settings. Program and controller initialization messages may be enabled or disabled as discussed in section 8.
When the SL-2001 is used as a general-purpose MIDI switcher, a zone may be bypassed to allow all MIDI data to How from
the zone's input to its output. The messages retain the same channel number as received. This mode is useful for sequencer
applications, where data on all sixteen MIDI channels is passed as a group from a SL-2001 input to a SL-2001 output, (sys-
• tern-exclusive data is passed ONLY through bypassed zones). None of the processing or controller initialization functions
are available when a zone is bypassed.
Regardless of zone mode, all note messages issued to the output are monitored. Whenever a zone is turned off, note-off mes-
sages are automatically issued to clear any sustained notes.
DEVICE NAMES
The SL-2001 offers simplified programming and operation by allowing all MIDI devices in the system to be designated by a
five-character name. Before any programming begins, these names are entered into the SL-2001. While entering the device
names, the user also specifies the MIDI port to which the device has been connected (MIDI IN A-D or MIDI OUT A-D) and
the MIDI channel (1 through 16) on which the device is set. For all subsequent programming, devices are specified by name
only; the port and channel are not required as they are implied by the name. For large MIDI systems in particular, this makes
programming much more efficient as it relieves the musician of having to remember the port and channel number for each
device.
Some synthesizers are multi-timbral, which means that they are able to produce several different sounds simultaneously, such
as strings, organ, and piano sounds. Each of the sounds is controlled by information on a different MIDI channel. When
used with the SL-2001, a multi-timbral instrument should actually be considered as more than one instrument, and each
should have a unique name in the SL-2001 device list. For example, if sound module XYZ can produce two sounds inde-
pendently, we can install two devices into the SL-2001: XYZ1 and XYZ2.
The SL-2001 master keyboard is represented by the device name "2001"; this name may not be edited or deleted. Be sure to
consult section 4 to install device names before you attempt to program the SL-2001.
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