Behringer NEUTRON Reference guide

Synthesizers and Samplers
NEUTRON
Paraphonic Analog and Semi-Modular
Synthesizer with Dual 3340 VCOs,
Multi-Mode VCF, 2 ADSRs, BBD Delay and
Overdrive Circuit in a Eurorack Format
985-40000-01101 Rev.A
2021-02-03 page 1 of 7
Condential, for internal use only. Not to be reproduced.
User Support Bulletin
Calibration Procedure
Follow all steps in the order in which they are presented.
IMPORTANT NOTE: Make sure the unit has been powered on for more than 30 minutes, and that it is in a place where the
temperature will not change drastically while performing the calibration.
Introduction
The unit is carefully calibrated at the factory. The performance may change over time or due to environmental changes,
and the following recalibration procedures can be used to bring it back to its factory settings. If you do not feel comfortable
doing these calibrations, then we recommend they are done by an experienced audio service technician. This is especially true
for those units that need to be opened to gain access to voltage test points and calibration potentiometers.
CAUTION: Incorrect calibration or damage to the delicate adjustment potentiometers may lead to the unit
becoming inoperable.
Note: Although re-calibration will not invalidate the warranty, any damage caused during re-calibration may invalidate
the warranty.
Equipment required
1. Digital DC Voltmeter
2. 3.5 mm patch cable
3. Phillips screw driver
4. Small Insulated trimmer screwdriver
5. PC Computer with MIDI-OX installed
6. USB cable

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Run MIDI-OX on your computer. Go to OPTIONS > MIDI DEVICES.
Insert the patch cable into the ASSIGN output on the Neutron front panel.
This calibration has been carried out by the factory at the manufacturing stage but instructions are described here if needed.
Assign Out Calibration
Select Neutron as the MIDI IN and MIDI OUT.

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Make sure “Pass SysEx” at the bottom of the Options drop-down menu is ticked.
In the VIEW menu, select SysEx...

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In the Command Window, enter the SysEx command to be sent to the Neutron. For ASSIGN out calibration at 1 V,
the command is: F0 00 20 32 28 7F 10 20 F7
In the Command Window drop-down menu, select Send SysEx. The Sysex command will be sent to the Neutron.
Both 8' octave range LEDs will be ashing to indicate the Neutron is in ASSIGN out 1 V calibration mode.
Measure the voltage on the patch cable attached to the ASSIGN out and adjust until it reads 1 V +/- 0.001 V.

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To increase the voltage send the Sysex command F0 00 20 32 28 F7 10 23 F7.To decrease the voltage, send the Sysex
command F0 00 20 32 28 F7 10 22 F7.Repeat until the voltage reads 1 V +/- 0.001 V. Then move on to step 10.
Send the Sysex command for ASSIGN out calibration to the Neutron at 4 V. The command is F0 00 20 32 28 7F 10 21 F7.
Both 32' octave range LEDs will be ashing to indicate the Neutron is in ASSIGN out 4 V calibration mode.
Repeat step 9 until the voltage reads 4 V +/- 0.001 V. Then move onto step 12.
Save the calibration data and exit calibration mode by sending the Sysex command F0 00 20 32 28 7F 10 24 F7.
The Neutron will return to its normal operating mode.
The Neutron Delay stage is designed to give as much control and variety as possible to the user. With that in mind, it may be
necessary to tweak your Neutron to sound the way you want it to.
First, decide how much feedback you want. Adding more feedback gives the option of having the delay stage feedback on itself
creating screaming eects. This results in higher distortion through the circuit, which may be a desirable eect.
Warning! When completing this procedure please keep the level down low as it may get loud.
Bucket Brigade Delay Calibration
Turn o the unit.
Open the unit by removing the top 8 screws. Lift the top panel carefully from the lower edge to give access to trim pots
VR37 and VR38. Take care not to put strain on the ribbon connector.

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NEUTRON
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Make sure that the circuit board is not touching any bare metal that may cause a short circuit and damage
the unit. Do not touch the circuit board while the unit is powered up.
Carefully power up the unit.
Set the Delay Time and Repeats controls fully clockwise (turning to the right) and set the Mix control to 12 o’clock.
Turn VR37 fully CW.
Turn the Time control fully counter clockwise to the left (faster repeats), the circuit should feedback and scream at you.
With the delay feeding back on itself turn VR37 CCW until the repeats soften but do not die o.
To test the setup:
- Turn the Repeats control fully CCW so that there are no repeats and the Time fully clockwise for long repeats.
- Next, turn the Repeats control up full again.
- When the Time control is turned fully CCW the delay should start to feedback again, if not dial VR37 CW a little further.
Or alternatively, if it feeds back too easily or if you don’t want this behavior at all, turn VR37 a little more CCW to
reduce the eect of the feedback.
If you would like clean repeats lower the amount of feedback so the delay does not feedback on itself easily, or at
all, and keep the level through the delay circuit low. This can be achieved by using the Overdrive level to control the
amount of signal sent to the delay. This exibility lets you achieve clean and crisp repeats or a delay that screams at you
as you let it feedback on itself.

Synthesizers and Samplers
NEUTRON
Condential, for internal use only. Not to be reproduced.
Music Tribe accepts no liability for any loss which may be suered by any person who relies either wholly or in part upon any description, photograph, or statement contained herein.
Technical specications, appearances and other information are subject to change without notice. All trademarks are the property of their respective owners. Midas, Klark Teknik,
Lab Gruppen, Lake, Tannoy, Turbosound, TC Electronic, TC Helicon, Behringer, Bugera, Oberheim, Auratone and Coolaudio are trademarks or registered trademarks of Music Tribe Global
Brands Ltd. © Music Tribe Global Brands Ltd. 2021 All rights reserved.
Once the Repeats calibration has been completed you may need to dial out some clock noise from the delay output. This
procedure has knock on eects to the repeats calibration so once complete, you may need to repeat the previous stage until
you nd the right balance. The output level may need to be increased so that clock noise can be heard; this will sound like a high
frequency drone in the background of any signals played through the delay.
Clock Noise Calibration
Turn Time fully CW and both Repeats and Mix to 3 o’clock.
Set VCA Bias fully CW so a signal is fed through the system and heard at the output. If you have no audio check that the
VCF is not cutting o any audio and that the Overdrive level is up. A low frequency sound may be best, one so that you
can easily distinguish the clock noise.
With a constant drone on the output turn VR38 until you can hear clock noise, then move VR38 until the clock noise is
at a minimum. Note, with long repeats there will always be a bit of clock noise present.
Reassemble the Unit.
End of Procedure