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MIDI Resource System
Compatible with virtually all pipe
organs with electric key and
stop action.
Highly intuitive for organists to use.
Control panel puts main functions at
an organist’s fingertips.
Send commands to sound modules
from pistons or stops and the
control panel.
MIDI couplers are supported for
each division.
The Peterson MIDI Resource SystemTM brings the
advantages of “Musical Instrument Digital Interface”
technology to organists in a most intuitive way. This
versatile interface system may be configured to allow
organists to record and play back performances,
operate sound modules via standard organ console
controls, and even interact with commonly available
music editing and transcribing software. The MIDI
Resource System is compatible with nearly all pipe
organs that have electric key and stop action.
In its most basic form, the MIDI Resource System
can be provided as an “out only” system to send digital
messages to MIDI compatible devices such as sound
modules. When configured as a “record/playback only”
system, status change information about all keys, stops,
expression contacts, and miscellaneous controls can be
recorded onto a floppy disk via a MIDI sequencer. The
recorded data files may then be selected by song name
and used to play the organ exactly the way it was
recorded. This makes it possible for an organist to
review and evaluate the performance from various
vantage points in the room, and is also useful for
pre-recording music for such events as wedding
rehearsals or choir practices so that the organist need
not actually be present.
A proprietary stop encoding protocol developed by
Peterson makes it possible to use disks recorded on
one organ to appropriately register other MIDI
Resource System equipped instruments, even though
the stop lists will almost certainly be different. By using
any of several MIDI software programs on a personal
computer, the recorded files can be edited to correct
mistakes, quantize notes to various degrees to smooth
out any rhythm irregularities, or manually add notes.
The music can then be printed on an organ-standard
three staff score. A DOS based program developed by
Peterson may be used to insert, edit, or delete organ
stop registrations and expression values.
A MIDI Resource System configured for “full in and
out” allows record/playback functionality and also
provides a wide selection of features for conveniently
controlling sound modules from the console. While
other MIDI interface systems for pipe organs allow
an organist to send instructions to remote sound
modules, the Peterson MIDI Resource System offers
unprecedented flexibility in how this is accomplished.
Digital codes called “patch changes”, used to
command sound modules to play desired voices in
response to notes played on a particular channel
(or keyboard), can be stored in memory. Patch changes
may then be sent via traditional thumb or toe pistons,
stop controls or buttons on the MIDI Control Panel.
Separate patches may be saved to pistons on each
of 32 or 99 memory levels, which may be selected
independently or linked to the memory levels of a
Peterson Duo-SetTM or MSP-1000TM combination
action. MIDI General pistons can each send as many
as 16 separate patch changes virtually at once, through
a process called “layering”. Layered patches allow
controlling multiple voices on the same or different
keyboards and may include “Bank Select” messages to
access more than the normal 128 voices. MIDI
Divisional pistons can each send two patches in quick
succession. MIDI pistons are programmed by simple
procedures just like the capture or tripper methods of
setting a combination action. Pistons then operate in an
intuitive and “organ-like” manner.
As an alternative to MIDI pistons, patch changes may
be sent from traditional stop controls, usually engraved
Proprietary “stop mapping” for
compatibility of recordings with
other organs is available.
Sound module volume or velocity
can be controlled from organ’s
expression shoes.
Sustain or sostenuto function is
supported for sound modules
that respond to these messages.
Extensive built-in self-diagnostics
are provided.
Traditional Peterson modular base
system design.
“MIDI On...” a division name or “MIDI A”, “MIDI B”,
etc. and located within each division’s stop group.
MIDI coupler tabs or drawknobs are also supported.
Special coupler controls for each division, usually
engraved “MIDI To...” the division name, allow quick
enabling or silencing of the sound module voices
played from each individual keyboard. Unison, Sub,
and Super MIDI couplers may be utilized.
The MIDI Resource System’s control panel allows
selection and display of the MIDI channel and program
numbers that are to be assigned to each keyboard. A
patch change channel and program combination may
be sent directly from the control panel, or saved on a
piston or stop control for convenient use later. The
control panel also includes an All Notes Off (“ANO”)
button to instantly cancel all notes on all connected
sound modules without changing any other settings;
an On/Off switch for the MIDI Interface in its entirety;
and a tuning knob for adjusting the pitch of any sound
modules that are compatible with remote tuning
Expression shoes on a console may be configured
to control the volume or velocity of sound module
voices in various divisions. Sustain or sostenuto function
is supported, as are alternate program number banks
now found on many MIDI sound modules.
Each MIDI Resource System is provided to the
organ builder with the circuit board modules required
for the capacity and options specified. There is no
job-by-job factory software programming involved;
the operating software is standard and identical for
all systems except as backwards-compatible improvements are made. Special “Diagnostics” and “Assign
Stops” menus allow an installer to configure and test
all functions by following step-by-step instructions
and viewing displays on the main control panel. A
comprehensive array of color-coded diagnostic LEDs
monitor the operation of the circuitry.
Using a MIDI Resource System in conjunction with
a Peterson OrgaPlexTM switching and coupler system
is preferred but not required. Note, stop, expression,
and miscellaneous control data that is already in
OrgaPlex serial form can be translated to and from
the MIDI system with the least hardware required,
but encoder boards are available at a modest additional
cost when installing MIDI on a non-OrgaPlex-equipped
instrument. All contacts must be fed from organ
positive polarity. Flyback spike protection, standard
on the coil drivers of virtually all solid state pipe organ
control systems, must be provided for all coils. In
certain cases, such as where some coils in the organ
are still operated by non solid state relays, discrete
diodes must be added either directly across the coils
or on circuit boards available from Peterson that may
be plugged onto Peterson junctions.
Versatile, full-featured, and easy to use, the MIDI
Resource System by Peterson is truly a useful addition
to new and rebuilt pipe organs alike.
MIDI Main Control Panel
MIDI Connector Panel with Brass Bezel
Operating Voltage: Organ rectifier 12 -18 VDC. Supplied Class 2 transformer
or optional Peterson Console AC Control System must be plugged into a 117 VAC
50/60 Hz always-on outlet.
Organ Data: Preferred connection is via OrgaPlexTM serial data lines. Alternate
methods using DC Encoder boards require positive keying and positive stop
MIDI Data: MIDI-standard 5 pin DIN connectors are provided.
Capacities: Up to 5 keyboards using parallel format or 7 keyboards in
OrgaPlex serial format are supported, plus 288 Stops and 72 pistons.
Transposer: Can interface with OrgaPlex or Diode Matrix switching systems.
Inputs: Lock Out, Set, Cancel, Start, Stop, Continue, All Stops Off, Auto
Resend, and Sustain (Sostenuto).
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