Cedar CR-1 De-Crackler User manual

CEDAR
Professional Hardware Systems
CR-1 De-Crackler
Digital Audio Restoration System
SERIES 2
OWNER'S MANUAL
© 1994 CEDAR Audio Ltd. Written by Gordon Reid
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page - 1
October 11, 1995

TABLE OF CONTENTS
TABLE OF CONTENTS .............................................................................................2
INTRODUCTION ........................................................................................................3
THE BACKGROUND TO CRACKLE REMOV AL..............................................4
SAFETY INSTRUCTIONS .........................................................................................5
SET UP ...........................................................................................................................7
Unpacking and Inspection .............................................................................7
Installation site ..................................................................................................7
Rack Mounting .................................................................................................7
Free Standing use .............................................................................................7
CONNECTIONS ..........................................................................................................8
Before Connection ...........................................................................................8
Power Connections ..........................................................................................8
Signal Lead Connections ................................................................................8
Other Connections .......................................... .. ...............................................10
SAMPLE INSTALLATION IDEAS......................................................................... 11
A GUIDE TO RESTORATION PROCESSING ...... .. .............................................12
FRONT PANEL INDICATORS AND CONTROLS .............................................14
QUICK TOUR .................................................. .. ...........................................................16
W ARMST ART AND COLDST ART ........................................................................17
OPERATING THE CEDAR CR-l SERIES 2...........................................................18
Dedicated Controls ..................... .. ..................................................................18
PAGES ...............................................................................................................20
Control Page ......................................................................................... 21
Input/Output Control Page ..............................................................24
Remote Control ....................................................................................28
Status Page ............................................................................................29
Sta
tus Indica tors...................................................................................29
NOTES AND HINTS TO USERS
REMOTE CONTROL PROTOCOLS .......................................................................33
RS232...................................................................................................................33
MID!.................................................................................................................... 35
SELF TEST MODE ......................................................................................................36
CR- 1 SERIES 2: Rev.02 Ver.3.06
Page-2
October
10, 1995

INTRODUCTION
Thank you for purchasing the CEDAR CR-1 De-Crackler. The original CR-1 was the
world's first real-time dedicated digital de-crackler, offering unique buzz removal
and distortion reduction facilities. The
CR-1 SERIES 2 offers even greater
processing power and performance -power exceeding that obtained using digital
signal processors (DSPs) installed
in desk-top (or larger) computer systems
(excepting, of course, the CEDAR Production Systems.
The
CR-1 SERIES 2 is designed for professional use, although it will work perfectly
well
in a domestic environment, and its features include the following:
• The latest 'SERIES-2' CEDAR hardware.
• Digital Audio interfaces conforming
to tile AES/EBU and SP-DIF standards.
• 24-bit input and output resolution when using AES/EBU interfaces
• Three sample rates supported
on digital inputs: 32kHz, 44.1 kHz and 48kHz
• Two sample rates supported
on analogue inputs: 44.1 kHz and 48kHz
• Balanced analogue inputs and outputs for connection to professional
analogue equipment.
• ADC and DAC converters using the latest
64x over-sampling /1- I. (Delta-
Sigma) technology.
• >103dB dynamic range
AID and >93dB dynamic range D/A
• Mountable in a 19" EIA rack.
• Remote control via MIDI and RS232 interfaces.
• SMPTE/EBU timecode capabilities via optional upgrade
• Input and output LED bar-graph
VU meters.
• Twin
40 -bit 'I'Ioating point DSP processors delivering 50MFIops to handle the
most complex audio processing requirements.
• High levels of artificial intelligence designed into the
CR-1 program
algorithms making
it extremely simple to use.
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page - 3
October
10 . 1995

THE BACKGROUND TO CRACKLE REMOVAL
The term 'crackle' is often used to describe many different audio phenomena -low
level high density ticks, surface noise, buzz, and some forms of amplitude
distortion·.
Fortunately, these degradations exhibit quite similar audio characteristics, and
we
have found that a single process -the unique CEDAR 'Split & Recombine' -is
capable of removing crackle, removing buzz, and significantly reducing many
instances of distortion.
The
CR-1 has been designed to perform real-time crackle removal, buzz removal,
and distortion reduction (which, for the remainder of this manual we shall refer to as
simply 'crackle removal').
The operation of the
CR-1 is totally digital, and any signal presented to the
analogue inputs is internally converted to a suitable digital format by the analogue-
to-digital converter (ADC). Following crackle removal the processed signal
is then
converted back from digital format
to analogue by the internal digital-to-analogue
converter (DAC).
For use with records, films, video, and tape,
no other device offers the power,
facilities, or accuracy of the
CR-1 SERIES 2.
• Distortion comes
in two families; amplitude-based distortions and time-
based distortions. Examples of the former are microphone diaphragm
grounding and overdriven mixer inputs; examples of the latter include tape
over-modulation and compression.
CR -1 SERIES 2: Rev. 02 Ver.3.06
Page-4
October 10, 1995

SAFETY INSTRUCTIONS
CAUTION:
1. Read all of these instructions
All safety and operating instructions should be read before the CR-1 SERIES
2 is operated.
2. Save these instructions for future reference.
3. Follow all warnings and instructions.
4. Water and Moisture
The CR-1 SERIES 2 should not be used near water, and must not be
exposed to rain or moisture. If the CR-1 is brought directly from a cold
environment into a warm one, moisture may condense inside the unit. This,
in itself, will not damage the CR-1 , but may cause hazardous electrical
shorting to occur. This could severely damage the CR-1 and even cause
danger to life.
ALWAYS allow time for the CR-1 to naturally reach ambient
temperatures before connecting the mains power.
5. Mounting
The CR-1 SERIES 2 should be carefully mounted in a 19" EIA rack, or
placed on a flat, stable surface. If used on a cart or free stand, care should
be taken when moved: uneven surfaces or excessive force may cause cart
and CR-1 to overturn. Do not position the CR-1 in a place subject to strong
sunlight, excessive dust, mechanical vibration or periodic shocks.
6. Wall or Ceiling Mounting
The CR-1 SERIES 2 has not been designed for mounting directly to walls or
ceilings.
7. Ventilation
Good air circulation is essential to prevent internal heat built-up within the
CR -1 SERIES 2. The CR-1 should be situated so that its position does not
interfere with proper ventilation. The CR-1 should not be placed in any
situation which impedes the flow of air through the vents at the front and
rear. Do not place the CR-1
on a soft surface.
8. External Heat Sources
The CR-1 SERIES 2 should be installed away from significant heat sources
such as radiators, and (if possible) away from other audio devices such as
amplifiers that produce large amounts of heat. Installation
in racks with
devices such as signal processors or tape machines should not be a
problem.
CR- 1 SERIES 2: Rev.02 Ver.3. 06
Page - 5
October 10, 1995

9. Power Sources
The CR-1 SERIES 2 features an auto-switching power supply which will
work safely on any mains supply
in the ranges 95v/130v and 190v/260v,
50Hz or 60Hz AC only.
You should never attempt to modify or adjust the internal power
supply
in any way. It contains no user serviceable parts.
10. Grounding or Polarisation
The CR-1 SERIES 2 should always be grounded (or 'earthed').
11. Power Cord Protection
Power connectors should be routed so that they will not be walked on or
pinched.
12. Extended Periods of Non-Use
The CR-1 SERIES 2 is not disconnected from the mains power as long as it
is connected to the wall outlet, even if the unit itself has been switched off.
Therefore, if the
CR-1 is not to be used for an extended period of time,
unplug the unit from the wall. Pull the connector out by the plug, never by the
cord itself.
13.
Cleaning
Clean only with a dry cloth. NEVER use liquid cleaners such as alcohol or
benzene on the
CR-1 SERIES 2. NEVER use abrasive pads on the CR-1.
14. Damage Requiring Service
The CR-1 SERIES 2 should be returned to qualified service personnel when:
• objects have fallen into the unit
• liquid has been spilled into the unit
• the unit has been exposed to rain
• the unit fails to function or appears to operate abnormally
• the unit has been dropped,
or the case damaged.
15.
Servicing
The user should not attempt to service the CR-1 SERIES 2 beyond the
instructions contained
in the User's Manual. All other servicing should be
referred to qualified service personnel.
CR- 1 SERIES 2: Rev.02 Ver.3. 06
Page - 6
October 10. 1995

SETUP
1. UNPACKING AND INSPECTION
Be careful not to damage the CR-1 SERIES 2 during unpacking. Save the
carton and all packing materials since you may need them to transport the
CR-1 SERIES 2 in the future.
In addition to the packaging, the carton should contain the following:
• mains connection lead
• this manual
• two blanking plates
2. INSTALLATION SITE
The CR-1 SERIES 2 may be used in most areas, but to maintain reliability
and prolong operating life observe the following environmental
considerations:
• Nominal temperature should
be maintained between 5° and 35°
Centigrade (41 ° and 95° Fahrenheit).
• Relative humidity should be
in the range 30% to 60% non-
condensing.
• Strong magnetic fields should not exist nearby.
3. RACK MOUNTING
The CR-1 SERIES 2can be mounted in a standard 19" EIA rack.
4. FREE STANDING USE
The CR-1 SERIES 2 can be used as a free-standing unit. The rack-mount
ears may then
be replaced by the blanking plates if desired.
To replace the ears with the blanking plates:
• Unscrew the three bolts which attach each ear to the chassis of the
CR-1.
• Attach the blanking plates
IJsing the same retaining bolts. Do not
over-tighten these bolts as doing so may cause damage to the CR-1.
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page - 7
October
10, 1995

Power
Balanced Balanced Connector
Timecode
Analogue Analogue with integral
Input and Output
Inputs Outputs fuse holder
I
-I
LTC VITC
t t t j j
R - IN - L R - OUT - L IN - LTC -OUT IN -VlTC -OUT • CAUTION
• •
POWER
A~O IA~ 0
RISK ;'~~~oc. ~
w@} ~ 00 .. \@~
, 0 0 0 ~~.
o o
o
~A\'~A\ .~.
AES - IN - SPOIF SPDIF - OU~ - AES IN OUT THRU I •
RS 232 INTERFACE
8 0 0 0· @@@
0
•
~
o. • ~
00
~
L---, J
Digital 110
SP-DIF I I
I MIDI
In/OutlThru RS232 Interface
Digital
110
AESIEBU

CONNECTIONS
The CR-1 SERIES 2 may be connected to most of the professional audio
equipment currently available. Three types of audio input and output are provided
(one analogue and two digital) and these will satisfy most users' interconnection
requirements. Full descriptions of these connectors will
be found later in the
manual.
1. BEFORE CONNECTION
• To prevent problems and possible equipment damage, turn off the
power to all equipment before making connections.
•
Be sure to insert plugs firmly into sockets. Loose connections may
cause hum and noise.
• When unplugging any lead, do
so by grasping the plug, not the lead.
2. POWER CONNECTIONS
Ensure that the CR-1 SERIES 2 is switched OFF before inserting the mains
lead.
NOTE: Users with 2-pin mains supplies:
When the CR-1 SERIES 2 is connected to other audio components, the AC
hum of the unit may be increased or decreased by reversing the direction of
the power connector
in the socket. Check that the cord is in the favourable
position ('in-phase') with respect to other audio devices
in the chain. This
will ensure that the best sound quality
is obtained from your CR-1.
For further information
on grounding and polarity consult a person familiar
with studio grounding techniques.
3. SIGNAL LEAD CONNECTIONS
Refer to the Rear Panel diagram:
The
CR-1 SERIES 2 offers three audio connection standards: one analogue
and two digital. These are:
• balanced analogue audio I/O
• digital SP-OIF format audio data
• digital AES/EBU format audio data
Note that the CR-1 SERIES 2 always passes its output to all three signal
outputs irrespective
of the input used, but that the digital data will only be
formatted for either AESIEBU or SP-OIF, as defined
by the userparameters.
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page - 8
October 10. 1995

(i)
Balanced analogue audio 1/0 (Pin 2 -
'hot')
This standard is used in professional audio equipment. Connect the
output from your source
to the balanced analogue inputs of the CR-1
SERIES 2 using standard XLR plugs. You will require two such
connections: one for each channel.
The balanced audio output may be used to connect the
CR-1 SERIES
2 directly to audio equipment such as mixing desks and professional
recorders featuring balanced XLR inputs and outputs.
(ii) Digital SP-DIF format audio data
The SP-DIF format is used by domestic and semi-professional digital
audio devices such
as DAT machines, some ADCs, and some CD
players. Both audio channels are carried along a single cable,
so you
may connect the SP-DIF output from your source to the SP-DIF input
of the
CR-1 SERIES 2 using a single cable terminated with RCA (or
'phono') plugs.
The SP-DIF output of the
CR-1 SERIES 2 may be connected to the
SP-DIF input of your recording device or external DAC.
(iii) Digital AES/EBU format audio data
The digital AES/EBU format is used by professional digital audio
devices including mastering systems, DASH recorders, and high
quality ADCs & DACs. Both channels of audio are carried along a
single cable, so you may connect the AES/EBU output from your
source to the AES/EBU input of the
CR-1 SERIES 2 using a single
cable terminated with XLR plugs.
The AES/EBU output of the
CR-1 SERIES 2 may be connected to the
AES/EBU input
of your digital mixer, recording device or external
DAC.
24-bit Digital data resolution:
The CR-1 SERIES 2 features 24-bit input and output resolution
whenever the AES/EBU digital input and output are utilised.
Dithering:
The CR-1 SERIES 2 also features TPDF (Triangular Probability
Density Function) dithering. This
is applied to the digital data when
the SP-DIF output format is selected. Dithering
is always applied to
the data presented to the DACs.
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page-9
October
10, 1995

4. OTHER CONNECTIONS
(i) SMPTE/EBU
An optional SMPTE/EBU interface offering LTC and VITC protocols is
available for the CR-1 SERIES 2. The standard C R-1 SERIES 2 does
not support timecode and these connectors are not present.
(ii) MIDI IN/OUT/THRU
The operation of the CR-1 SERIES 2 may be controlled using the
Musical Instrument Digital Interface (MIDI). Refer to the chapter on
Remote Control Protocols for further instructions.
(iii) RS232
The CR-1 SERIES 2 may be controlled using the standard RS232
serial communications protocol. Refer to the chapter on Remote
Control Protocols for further instructions.
CR-1 SERIES 2: Rev.02 Ver .3.06
Page - 10
October 10. 1995

--
- -
--
SAMPLE INSTALLATION IDEAS
anaklgue or analogue or
or
Ina olA
dignal in digi tal out
-
igrtal in
TURNTABLE 0
CR·1
RECORDER
TAPE MACHINE
I
-
lnein
AMP
I
1. CR-1 SERIES 2 used in-line for transcription or broadcast purposes.
anaklgue or analogue or
anakl9ue or
di gnal in dignalout
digital in
•
RECORDER
MIXER ellects return
I I
linen
l...
CR·1
I
AMP
I
2. CR-1 SERIES 2 used on the effects loop within a stud
io environment.
anabgueor
anabgue or
analogue or
analogue or
di ilal in
--
RECORDER
line in
AMP
3. CR-1 SERIES 2 used in-line prior to an editor or aud
io workstation.
SOURCE
li ne cui
di ita I in
di nal in d' italoul
SOURCE
CR·1
CEDAR
or other workstation/editor
CR- 1 SERIES 2: Rev.02 Ver.3.06
Page - 11
October 10. 1995

A GUIDE TO RESTORATION PROCESSING
Contrary to 'common sense', the order in which restoration processes are carried
out makes a great deal of difference to the quality of the final result. Consequently,
there is one 'right way' and many 'wrong ways' to restore your material.
Following these guidelines will help you to achieve the best results
on most
material:
• De-Clicking (De-Scratching) should ALWAYS
be carried out first. This is
because:
Large clicks make
it difficult for the De-Crackling process to identify
and remove the tiny clicks and crackles that constitute surface noise,
buzz, and other such problems.
ii All clicks and scratches are,
in effect, tightly defined packets of white
noise.
If clicks are presented to any of the CEDAR De-Hiss products
(HISS-1, HISS-2,
DH-1 De-Hiss) they confuse the processes, and
create unmusical side effects.
In addition, De-Hissing at this stage will
make
it almost impossible to identify and remove clicks and scratches
at a later time.
• De-Crackling should
be the next process because even small crackles can
cause the same problems
as in (ii) above.
• Azimuth Correction can
be carried out either before or after De-Hissing, but
experience shows that best results are obtained using the
AZ-1 or Phase-EX
module before De-Hiss.
• Finally, apply whichever De-Hiss process you wish to use.
Note: If you have the full range of CEDAR restoration modules they should be
connected as shown
in the diagram overleaf. Please note that, to maintain
the maximum fidelity
and remove and possible sources of degradation
between processes, connections between modules should be
by AESIEBU
(24-bit) format.
CR- 1 SERIES 2: Rev,02 Ver.3.06 Page -
12
October 10 , 1995

Firstly, De-Clickyour material
Next, remove crackle and buzz, and reduce distortion if appropriate
Then applyAzimuth Correction to material with phase andbalance problems
Finally, apply noise reduction.
CR- 1 SERIES 2: Rev. 02 Ver.3.06
Page - 13
October
10, 1995

0 0
CD
0
CD
CD
0
Power
Switch
Input
Signal
Meters
output
Signal
Meters
LCD
Screen Status Indicators
Defined
Function
Keys
a- dial
Control
Wheel
Headphone
Level
Control
o
Headphones
Socket
CD
Input
Level
Control
@
Output
Attenuation
Control
@
t t t t t
Fl F2 F3 F4 FS
I
Function Contrast
Keys
Control
@
@)

LOCATION AND FUNCTION OF FRONT PANEL
INDICATORS AND CONTROLS
Refer to the Front Panel diagram:
1 . Power Switch
2. Input Signal Meters (Left and Right)
Digital signal meters display the peak value of the selected input in dBOs.
The 'Over' indicators will light if the input signal remains at full scale for four
or more consecutive samples.
3. Output Signal Meters (Left and Right)
Calibrated signal meters display the RMS value of all output signals.
The 'Over' indicators will light if the output signal remains at full scale for four
or more consecutive samples.
4. LCD Screen
Provides you with a variety of information and messages, keeping you
aware of what is currently happening
in the CR-1 SERIES 2.
All the control screens of the CR-1 SERIES 2 are displayed on the LCD
screen. Please refer to the following chapters for full instructions.
5. Status Indicators
Indicate the status of the analogue and digital inputs, and whether the CR-1
SERIES 2 is in idle or processing modes.
Also indicate the possible causes should the unit fail to function.
6. Dedicated Function Keys.
Certain functions are fundamental to operating the CR-1 SERIES 2, and
these are controlled by the Dedicated function keys: Bypass, Page, Pre/Post,
and Enter.
7. a-dial (Spinwheel)
The a-dial enables you to increase and decrease control values. Please
refer to the following chapters for full instructions.
8. Headphone Socket
For use with stereo headphones only. Accepts a standard 1/4" stereo jack
plug.
DO NOT use 2-conductor mono headphones with the CR-1 SERIES 2.
9. Headphone Level Control
Use this to adjust for a satisfactory listening level. This level control will not
alter the signal level
at any of the rear panel outputs.
CR- 1 SERIES 2: Rev.02 Ver.3.06
Page - 14
October 10, 1995

10. Input Level Control
This control acts upon the analogue inputs only. Use it to adjust the volume
of incoming analogue signals to the desired level. A level of approximately 0
to -3dB (as shown
on the Input Signal Meters) will offer best results.
The Input Level Control may be physically bypassed internally to obtain the
best possible signal
to noise ratio (SIN) from the ADCs. This work must be
carried out by qualified service personnel, so please refer to your authorised
dealer
or directly to CEDAR Audio to have this modification performed.
11. Output Attenuation Control
A digital gain control with range 0 to -1 OdB in 1dB steps.
12. Function Keys
Use along with the LCD screen. Please refer to the following chapters for full
instructions.
13. Contrast Control
The LCD screen may be adjusted for optimum visibility. Use a fine
screwdriver to make such adjustments.
CR- 1 SERIES 2: Rev.02 Ver.3.06
Page - 15
October 10, 1995

QUICK TOUR
If you are impatient to hear some immediate results using your CR-1 SERIES 2 the
following instructions should have you up and running within a few minutes:
1 . READ THE SAFETY INSTRUCTIONS.
2. Connect the CR-1 SERIES 2to the mains supply.
3. Connect your input and output devices to the CR-1 SERIES 2 using the
appropriate input and output sockets. (If
in doubt, please refer to the section
CONNECTING THE CR-1 SERIES 2 and the manuals of your other
equipment).
4. Hold down the function key F1 and switch on the CR-1 SERIES 2.
5(i) If you are using analogue inputs press PAGE once. Press B to select
'analogue'. Then press PAGE twice more
to return to the Control Page.
5(ii) If you are using digital inputs from a consumer format machine such as a
domestic OAT recorder press PAGE once, then press B twice to select 'SP-
OIF'.
If you are outputting to a consumer format machine such as a low-cost
OAT recorder press A to select SP-OIF format.
Press PAGE twice
to return to the Control Page
Note: The CR-1 SERIES 2 defaults to AESIEBU PROFESSIONAL format,
so skip both instructions 5(i) and 5(ii) if your CR-1 SERIES 2 is
connected
to a system such as the Sony PCM1630.
6. Play your material.
7. Press PRE/POST to hear an immediate difference between the processed
and unprocessed signals (assuming, of course, that your original material
suffers from crackle, buzz and/or distortion).
This section should have whetted your appetite,
so you should now proceed to the
rest of the manual to ensure that you can obtain the best results from your CEDAR
CR-1 SERIES 2.
CR- 1 SERIES 2: Rev. 02 Ver.3.06 Page -
16
October
10, 1995

WARMSTART AND COLDSTART
The CR-1 SERIES 2 features Warmstart and Coldstart options. Warmstart has been
added
so that the unit can be configured once, and these parameters are then
automatically recalled
on every power-up. This is ideal for applications where time-
consuming set-ups at the start of each session are not practical.
Coldstart
If the CR-1 SERIES 2 has not been used for some time the system will
automatically Coldstart. This process initialises all parameters to their factory
default values, and after a few seconds will automatically enter at Page
1.
On start-up the message 'Coldstart' will be displayed at the top right of the start-up
screen on the LCD display. The screen will then enter PAGE 1, which wi" show the
default Parameters:
The default values are: Detect = 0
Threshold = 8
Mode = Crackle1
Other default values are: Digital Output = AES/EBU
Input Source = AES/EBU
Receiver Error Level = 1 - Lock
MIDI = Channel 1
Bypass =
OFF
A to 0 frequency = 44.1 kHz
Pre/Post = Post
Warmstart
The CR-1 SERIES 2 remembers the latest parameters used, and the page that was
active
at the time that the system was last switched off.
On start-up the CR-1 SERIES 2 will display the message 'Warmstart' on the screen,
and after a few seconds will re-enter at the appropriate page, with all user
parameters set to their previous values.
User Coldstart
If you wish to force the CR-1 SERIES 2to Coldstart, hold down Function Key F1
while switching on the system. Release F1 when the message Coldstart is seen on
the LCD display.
Note: In common with all otherdigital devices, and irrespective of whetheryou are
Warmstarting
or Coldstarting the CR-1, you should always allow a few
seconds between switching the unit off,
and switching it on again.
CR- 1 SERIES 2: Rev.02 Ver.3.06
Page - 17
October 10, 1995

OPERATING THE CEDAR CR-1 SERIES 2
1. DEDICATED CONTROLS:
The CR-1 SERIES 2 features a number of dedicated controls to speed operation.
These are:
Dedicated Function Keys: • Bypass • Page
• Pre/Post • Enter
I/O Level Controls Input Level
• Output Attenuation
These are now explained in turn:
Bypass
You may wish to bypass completely the operation of the CR-1 SERIES
2. Press
BYPASS to do this. The current status will be indicated on the Status LED.
The Bypass does not 'hard-wire' the input to the output. Analogue signals still pass
through the AtoD and DtoA stages.
Notes: • There is a delay of approximately 1.3mS in any analogue-to-analogue
signal passedthrough the CR-1 SERIES 2
in Bypass mode.
• There is a delay
of approximately O. 1 mS in any digital-to-digital signal
passed through the CR-1 SERIES 2
in Bypass mode.
• All delays are 'group delays'
(i.e. are constant at all frequencies) and
are measured at a sample rate of 44.1kHz.
Page
Use this Function Key to move between Pages.
Pre/Post
It will often be useful to compare the original signal with the post-processing output
of the CR-1 SERIES
2. The current status will be indicated on the Status LEOs.
Enter
The ENTER Key has three functions: as a LOCK-OUT key, preventing accidental
changing of parameters; as a CLEAR key, resetting error messages, and as a MIDI
DUMP command.
These first two functions are, of course, context sensitive, and the key's action will
be appropriate to the page displayed (see below). The MIDI DUMP will be initiated
every time that the ENTER key is pressed, regardless of context.
CR- 1 SERIES 2: Rev.02 Ver.3.06 Page -
18
October 10, 1995