NAAD LD4 User manual

1.Outline of I/O interface
❶MIDI IN
You can connect a MIDI sequencer or MIDI Drum Pad Controller. Trigger sound and
control of each parameter. Also it can load tone programs.
❷MIDI OUT
Use it for synchronized playback with an external sequencer. System real time messages
such as MIDI TIMING CLOCK or START / STOP can be sent from the internal sequencer.
❸GATE IN
Connect to the GATE OUT Jack of an analog sequencer or the like. Trigger sound each A,
B, C, D channels. Allowable voltage is 0 to 10V.
❹CV IN
Connect to CV OUT Jack of an analog sequencer or the like. Allowable voltage is 0 to 5V.
The input voltages controls the pitch of main oscillator for each channel. It conforms to
the specifications V/OCT. Fine adjustment of the input voltage can be tweaked trimmers
on the back of the board.
❺OUTPUT
It is stereo audio out jack. The balance of the L/R channel can be adjusted by setting
PAN.
SWD - Pins are exposed on the back
It is used for firmware update and debugging during development. Connect a
Programmer / debugger such as ST-LINK/V2
The source code of firmware can be obtained from the following repository
[email protected]:oxxxide/NAADLD4FIRMWARE.git
USB Port [MicroB]
When power is not supplied from the euro rack connector It is possible to power from the
USB port.
2. Physical Controllers Overview
❻Section select Knob
Select the section you want to edit.
❼Edit Knob 1/2/3/4
Increase or decrease assigned parameter. When two kinds of parameters are
written on the panel, you can set another parameter while holding down
[SHIFT] button.
SHIFT Button
It is used in conjunction with other controllers to access various functions
❽ENTRY Knob
In default sound edit mode, change the editing channel. other mode move the cursor, or
change value.
MENU Button
Switch to Menu Mode. You can configure various of system setting.
PROGRAM Button
Switch to Program Mode. You can store/load the tone program or the snapshot.
EXIT Button
Exit from the current mode and return to upper layer.
ENTER Button
To choose, confirm, or execute.
❾Trigger Button A / B / C / D
Trigger the Sound generator. These buttons correspond to channels A, B, C, and D.
In program mode, it is also used for channel selection.
3.Power supply
This machine conforms to Doepfer A-100 series standard (commonly known as Eurorack).
It is able to use 5V from the eurorack-16pin connector, also it can be supplied from the USB
port and play as a standalone synthesizer.
Current consumption is 170mA@5V. In case of insufficient electric power, be careful of the
maximum supply current of your power supply module as it may cause trouble.
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NAAD LD4
USER MANUAL
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er 1.1

5.Parameter details
OSCILLATOR
●Configure the main oscillator
WAVE
Select base waveform from sine, sawtooth, or pulsewave
PITCH
Set the base frequency. That conforms to a specification of MIDI Note Number.
FINE
Fine tune the pitch. The amount of change is up to ± 50 cents.
M.DEPTH
Set the modulation depth. The modulation source can be modified in the MODULATOR
section.
M.TYPE
Choose type of modulation.
FM: Frequency modulation AM: Amplitude modulation
AMPLIFIER
●Control the amplitude and its envelope for main oscillator.
LV
Sets the output level.
PAN
Modify the volume balance of the left and right channels.
ATK/HLD/SLP/REL
Modify envelope parameters for main oscillator.
MODULATOR
●This is sub-oscillator to modulate the main oscillator.
FREQ
Set frequency of sub-oscillator. This parameter is relative to the main oscillator.
ATK/HLD/SLP/REL
Modify envelope parameters for sub-oscillator.
BEND
●This is an envelope generator for control pitch of main oscillator.
AMT
The maximum amount of output level of the envelope.
VEL
Set the degree to change accent according to note on velocity value.
ATK/HLD/SLP/REL
Modify parameters for pitch-bend envelope.
NOISE
●Configure the noise generator.
LV
Sets the output level.
ATK/HLD/SLP/REL
Modify amplitude-envelope parameters for noise generator.
FILTER
●Configure the filter.
TYPE
choose a type of filter.
・Bypass: Signal pass the section.
・Low-Pass
・High-Pass
・Band-Pass
4.Overview of synthesis
This machiine has a 4 channel sound generator, it can play 4 different sounds at the
same time. Tone parameters can be set independently for each channel.
The synthesizing architecture of this machine consists mainly of six sections. The main
oscillator and the amplifier / EG connected immediately after it form the foundation of
the sound character. In MODULATOR section which is a sub oscillator, the main
oscillator is modulated by either method of FM / AM. BEND section controls the time
variation of the main oscillator pitch. The NOISE generator can mix it's sound
into the filter without sense of tone interval. In the Filter section you can adjust the
sound quality, add resonance and finish it into a unique synth sound.
MODULATOR
BEND
OSCILLATOR/AMP-EG
FILTER
NOISE
LFO
MIXER
DEPTH/FREQ
AM/FM
FREQ
FREQ
CUTOFF

CUTOFF
Cutoff frequency
RESONANCE
Set strength of resonanse. this value can be select as 7 steps value.
AMT
Set amount of filter-cutoff envelope.
DCY
Modify decay time of filter-cutoff envelope.
LFO
●It gives fluctuations to various parameters at a relatively low frequency.
DEST
Select destination of LFO.
・CUTOFF : Filter cutoff frequency
・OSC-PTCH : Frequency of main oscillator
・MOD-DEPTH : Modulation depth of main oscillator
・MOD-PITCH : Frequency of sub-oscillator(MODULATOR)
WAVE
Choose waveform of LFO.
SPEED
Set modulation rate of LFO.
DEPTH
Set amplitude of LFO.
６．Saving and Loading Program
●Temporary Save
The sound parameters under operation will be lost instantly when you turn off the power
because this machine is not equipped with a battery. When you perform the temporary
save operation, the temporarily saved data is autoloaded at startup and can continue
work even after rebooting.
Operation
１．Push [PROGRAM] button
２． Move the cursor to [Temporary Save] using [ENTRY] knob
３．Push [ENTER] button
●Store
Up to 128 tones can be stored in the internal memory of this machine.
When received a program change message, the stored tone data is loaded.
Operation
１．Push [PROGRAM] button
２．Move the cursor to [Store Program] with [ENTRY] knob
３．Push [ENTER] button
４．Choose target channel using [Trigger Button]
５． Select program number to write data with [ENTRY] knob
６．push [ENTER] button, then program will be saved to internal memory.
●Load
Load program data from internal memory
Operation
１．push [PROGRAM] button
２．Move the cursor to [Load Program] with [ENTRY] button
３．Push [ENTER] button
４．Choose target channel using [Trigger Button]
５．Select program number to load data with [ENTRY] knob
６．push [ENTER] button, then program will be load to choosed channel.
７．Push [EXIT] button
[ATK/HLD/SLP/REL envelope]
ATTACK
HOLD
RELEASE
SLOPE
ATK (ATTACK)
The time taken for initial run-up of level
from nil to peak.
HLD (HOLD)
Sets the absolute time to hold the
maximum value of the output.
SLP (SLOPE)
When larger than 0, The output value
decays during the hold time.
REL (RELEASE)
Sets the release time. It means
weakness of attenuation after hold time.

７．MIDI Configuration
●Mappings for MIDI Channnel and Note Number
Set the MIDI channel and note number to trigger the sound generator of this machine
Operation
１．Push [MENU] button
２．Move the cursor to [MIDI Mapping] with [ENTRY] knob
３．Push [ENTER] button
４．Use the [ENTRY] knob to select the channel of this machine.
[Edit knob 3 ,4] knobs to set each MIDI channel and MIDI note number.
５．Push [EXIT] button and then it quits this mode.
●Velocity curve
Sets the characteristic of the volume change to the velocity value.
Operation
１．Push [MENU] button
２．Move the cursor to [Velocity Curve] with [ENTRY] knob
３．Push [ENTER] button
４．Select type of velocity curve with [ENTRY] knob
・Exponential︓ A natural volume change can be obtained from the auditory sense.
・Linear ︓ It is easy to obtain volume even with a small velocity value.
・Fixed ︓ Fixed to the maximum volume.
５．Push [EXIT] button and then it quits this mode.
●Echo back
When set to ON, the signal input to the MIDI IN jack will be output to MIDI OUT as it is.
Operation
１．Push [MENU] button
２．Move the cursor to [Echo Back] with [ENTRY] knob
３．Push [ENTER] button
４．Choose ON or OFF with [ENTRY] knob
５．Push [EXIT] button and then it quits this mode
●Sync Configuration
Select whether to use the internal clock or external MIDI clock.
Operation
１．Push [MENU] button
２．Move the cursor to [Sync] with [ENTRY] knob
３．Push [ENTER] button
４．Choose Internal or External with [ENTRY] knob
５．Push [EXIT] button and then it quits this mode
８．Monitoring CV Input
●Monitor the voltage input to CV IN jacks.
The input voltage can be adjusted with trimpots on the backside of the board.
Operation
１．Push [MENU] button
２．Move the cursor to [CV Monitor] with [ENTRY] knob
３．Push [ENTER] button then displayed voltage each channels
４．Push [EXIT] button and then it quits this mode
９．Sequencer
●A 16-step sequencer is built into this machine. It is possible to play a simple loop with
this sequencer.
It is also possible to synchronize as Master / Slave using MIDI TIMING CLOCK.
◇Enter the Sequencer mode
１．Push [MENU] button
２．Move the cursor to [Sequencer] with [ENTRY] knob
３．Push [ENTER] button and then enter the sequencer mode.
◇Start/Stop
In the sequencer mode, push [ENTER] button to start/stop sequencer. When enabled
external sync, the sequencer doesnʼ t response by this action. because it follows
received MIDI Messages.
◇Three edit modes in Sequencer
The sequencer has 3 edit modes. Push [MENU] button then these screens change in
order.
◇Pattern Edit
[STEP] shows the currently selected step number. Using [ENTRY] knob to select the
step. The second line shows the sound ON/OFF of each channels. You can toggle the
state with [Trigger Button A / B / C / D]. Also change the BPM by tweaking [ENTRY]
knob while pressing [SHIFT] button.
STEP A B C D
LEN 2 4 16 16
STEP:01 BPM:131
A:* B:- C:* D:-
BeatRpt A B C D
ON 0 0 0 0
Pattern Edit Step Length
BeatRepeat
[MENU][MENU]
[MENU]

◇Step Length
This mode is able to change number of steps for each channel. To modify parameters,
tweak [EDIT KNOB 1/2/3/4] .
◇Beat Repeat
This function is a sequence effect that randomly hit a trigger repeatedly.
To switch the ON/OFF state with [ENTRY] knob. The frequency of occurrence can be set
in 8 levels from 0 to 7 for each channel. To change parameters, tweak [EDIT KNOB
1/2/3/4] .
◇Save sequence data
When "Temporary Save" is executed, sequence data is also saved at the same time. For
the operation procedure of Temporary Save, refer to "6. Saving and Loading Program"
１０．Factory Reset
●FACTORY RESET
Clear the internal memory then restore to the factory settings.
Operatin
１．Push [MENU] button
２．Move cursor to [Factory Reset] with [ENTRY] knob
３．Push [ENTER] button
４．A confirmation message will be displayed, then press [ENTER] button again.
５．It will restart automatically when initialization is completed.
１１．Control Change Number List
SECTION PARAMETER CC#
OSCILLATOR
WAVE 9
PITCH 2
FINE 3
M.DEPTH 12
M.TYPE 70
AMPLIFIER
LEVEL 8
PANPOT 10
ATTACK 73
HOLD 75
SLOPE 63
RELEASE 72
MODULATOR
FREQUENCY 14
ATTACK 15
HOLD 16
SLOPE 17
RELEASE 18
BEND
AMOUNT 19
VELOCITY SENSE 20
ATTACK 21
HOLD 22
SLOPE 23
RELEASE 24
NOISE
LEVEL 25
ATTACK 26
HOLD 27
SLOPE 28
RELEASE 29
FILTER
TYPE 30
CUTOFF 74
RESONANCE 71
AMOUNT 31
DECAY 41
LFO
DESTINATION 80
WAVE 81
SPEED 76
DEPTH 77

1２．Updating Firmware
●Using SWD Interface
The easiest way to update is using SWD interface. LD4 has pins dedicated to SWD
communication. However, this method requires a SWD Programmer like ST-LINK/V2.
We recommend STM32CubeProgrammer as writing application.
⇒ https://www.st.com/en/development-tools/stm32cubeprog.html
●Using DFU mode
When booted by DFU Mode, this machine is able to be written a firmware directly via
USB port without any special programmer/debugger. Firstly, to change boot mode,
remove the jumper cap from “BOOTMODE” pins.
We recommend STM32CubeProgrammer as writing application.
⇒ https://www.st.com/en/development-tools/stm32cubeprog.html
Then connet a USB cable between LD4 and your PC. and operate
STM32CubeProgrammer. The operation details are refer to the user manual of
STM32CubeProgrammer. After the writing succeeds, Donʼ t forget insert the jumper cap
to the “BOOTMODE” pins. Then push the reset switch and it will restarts the new
system.
manufactured by
Nishiasakusa Audio Developments
http://naad.tokyo/
[email protected]
Asakusa SkyResitel 801
2-9-2 NishiAsakusa Taitou-ku
Tokyo, Japan
SWD Interface
Reset Switch
USB port BOOTMODE
JUMPER
SWD Interface
Reset Switch
USB port BOOTMODE
JUMPER