Xaoc Devices BATUMI User manual

BATUMI
quadruple
low frequency
oscillator
Model of 1974
operator’s manual rev. 1974/5.3

SALUT
Thank you for purchasing this Xaoc Devices
product. Batumi  is a fully volt-
age-controlled quadruple digital low fre-
quency oscillator module with lots of inter-
esting user-customizable features. Each LFO
channel can be used independently or in one
-
tal frequency range spans from 28 hours (in
voltage controlled divide mode) up to 500Hz.
INSTALLATION
The module requires 10hp worth of free
space in the eurorack cabinet. The ribbon
type power cable must be plugged into the
bus board, paying close attention to polar-
ity orientation. The red stripe indicates the
negative 12V rail and should align with the
dot, –12V or red stripe marks on both the
unit and the bus board. The module itself is
secured against reversed power connection,
however reversing the 16-pin header may
cause serious damage to other compo-
nents of your system by short-circuiting
the +12V and +5V power rails. The module
should be fastened by mounting the supplied
screws before powering up. To better under-
stand the device, we strongly advise the user
to read through the entire manual before
using the module.
MODULE OVERVIEW
Batumi features four identical LFO chan-
       1
controls one of the four main parameters as
determined by the global mode setting. In
free mode, each slider determines its own
channel’s frequency (from 0.01Hz to 100Hz).
In the other three modes, slider 1 acts as a
master to the remaining channels’ frequen-
cy, allowing the remaining sliders to perform
other actions. For example, in phase mode,
sliders 2–4      quad
mode, sliders 2–4   
and in divide mode, sliders 2–4 
division of the master frequency. Frequency
can also be set with increased precision by
entering zoom mode, described later in this
manual.
The frq/ph/div input 2 allows the cor-
responding slider parameter to be voltage
controlled (1V/oct). Doing so allows for an
extended frequency range from 500Hz all the
way down to 53 minutes! Expected voltage
is –5V to +5V. Above 100Hz, the waveforms
tend to lose some precision and amplitude.
The reset/sync input 3 
trigger input that can serve as either cycle
reset or external tempo sync depending on
the jumper settings described later in this
manual. The sine output 4 produces a sine
waveform (–5V to +5V). In quad and phase
modes, the sines are shifted in relation to one
another. The saw/asgn output 5 produces
either a default upwards saw (ramp) wave-
form (–5V to +5V) or one of the user-select-
able shapes described later in this manual.
The square output 6 produces a square
waveform (–5V to +5V).
The LFO sync mode toggle section 7 allows
the four oscillators to run free or sync to the
master, as follows:
1. FREE LFO MODE
To enter this mode, click the central button
until the red, free LED lights up. Now, all
four LFO channels work independently.
2
module
explained

3

front panel
overview
1
2
3
4
5
6
7
10
11
8
9


2. QUADRATURE LFO MODE
Click the central button until the yellow,
quad
controlling the frequency of all the remain-
ing LFOs. Each subsequent LFO generates
a wave that is 90° shifted in relation to the
preceding one (90°, 180°, 270°). In this mode,
sliders 2–4 and the CV inputs control the re-
spective channel’s amplitude. The reset/
sync 2–4 inputs allow for additional control
described later in this manual.
3. PHASE LFO MODE
Click the central button until the yellow,
phase LED lights up. phase mode is similar
to quad mode, except that the amount of
phase shift can be set arbitrarily. Sliders 2–4
and frq inputs are active. The reset/sync
2–4 inputs allow for additional control de-
scribed later in this manual. A tip: in phase
mode, patch one of the LFOs to control the
phase shift of another. Stacking LFOs results
in new, complex waveforms.
4. DIVIDE LFO MODE
Click the central button until the blue, di-
vide LED lights up. LFOs 2–4 are synced
to LFO 1 with their frequencies occurring
at divisions of the master. Sliders 2–4 de-
      
can be 2, 3, 4, 8, 16 or 32 times slower than
the primary, master LFO’s cycle. The re-
set/sync 2–4 inputs allow for addition-
al control described later in this manual.
RESET & SYNC INPUT
The reset/sync input can serve two differ-
ent purposes. In reset mode an incoming
trigger impulse resets the LFO cycle to zero
state (hard sync). In sync mode (default set-
ting) the LFO frequency can be slaved to an
external clock source or tapped via manual
gate so that waveform phase is aligned to the
external clock.
These modes are selectable by the jumper 8

for reset, jumper present for sync) or via
the Poti module.
SYNCED MODES ADDITIONAL CONTROLS
In quad, phase and divide modes, the sec-
ond reset input holds (pauses) all the LFOs,
the third reset input reverses the direction
of the waveform, and the fourth reset input
selects the next waveform (see “Assignable
Waveforms”). Switching modes resets the
waveform to the default set by the jumper.
ZOOM MODE
To enter zoom mode, hold the central but-
ton for a second until the current mode LED
starts to blink. This mode upscales the slid-
er travel around the central value to allow
for precise adjustment. To exit zoom mode,
press the central button again. Upon exiting
zoom
the parameter value and slider position do
not match. In divide
adds or subtracts 0–3 to the division set out-
side of zoom mode.
ASSIGNABLE WAVEFORMS
The saw/asgn
provide one of the alternate waveforms. The
    
ramp, saw, triangle and trapezoid. To assign
the desired waveform, use the jumpers clus-
ter 9 on the back.
4

EXPANDABILITY
The functionality of Batumi can be greatly en-
hanced by adding two Xaoc modules: Poti and
Samara. Poti is a simple breakout module pro-
viding an immediate panel access to the Ba-
tumi functions originally selected by jumpers.
Samara II is an independent multi-function
module offering four channels of attenuation,
inversion, offsetting, mixing, minimum-maxi-
mum selection and basic waveshaping.
FIRMWARE UPDATES
The MiniUSB standard port 10 allows an
update procedure. Instructions are bundled

Mind the position of the update jumper 11 .
ACCESSORY
Our Coal Mine black panels are available for
all of Xaoc Devices modules. Sold separately.
Ask your favourite retailer. •
5
quadruple
lfo modes
FREE • four free running LFOs
90°
180°
270°
QUAD • 
cycle
cycle /2
cycle /3
cycle /8
DIVIDE • divisions of the master LFO frequency rate
PHASE • variable phase shift
phase shift


MAIN
FEATURES
Four digital
voltage controlled
LFOs
Free, Quadrature,
Phase and Divide
modes
Wide range, from
28 hours to 500 Hz
Assignable
waveform outputs
Zoom mode for
precise frequency
setting
Mini USB
connector for
easy updates
Alternate

Expandable
via Poti module
TECHNICAL
DETAILS
Eurorack synth
compatible
10hp, skiff friendly
Current draw:
+45mA / -15mA
Reverse power
protection
EASTERN BLOC TECHNOLOGIES MADE IN THE EUROPEAN UNION
ALL RIGHTS RESERVED. CONTENT COPYRIGHT ©2022 XAOC DEVICES. COPYING, DISTRIBUTION OR ANY
COMMERCIALUSEINANYWAYISSTRICTLYPROHIBITEDANDREQUIRESTHEWRITTENPERMISSIONBYXAOC
DEVICES. SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT PRIOR NOTICE. EDITING BY BRYAN NOLL.
WARRANTY TERMS
XAOC DEVICES WARRANTS THIS PRODUCT TO BE FREE OF DEFECTS IN MATERIALS OR WORKMANSHIP
AND TO CONFORM WITH THE SPECIFICATIONS AT THE TIME OF SHIPMENT FOR ONE YEAR FROM THE
DATE OF PURCHASE. DURING THAT PERIOD, ANY MALFUNCTIONING OR DAMAGED UNITS WILL BE
REPAIRED, SERVICED, AND CALIBRATED ON A RETURN-TO-FACTORY BASIS. THIS WARRANTY DOES NOT
COVER ANY PROBLEMS RESULTING FROM DAMAGES DURING SHIPPING, INCORRECT INSTALLATION OR
POWER SUPPLY, IMPROPER WORKING ENVIRONMENT, ABUSIVE TREATMENT, OR ANY OTHER OBVIOUS
USER-INFLICTED FAULT.
LEGACY SUPPORT
IF SOMETHING GOES WRONG WITH A XAOC PRODUCT AFTER THE WARRANTY PERIOD IS OVER, THERE IS
NO NEED TO WORRY, AS WE’RE STILL HAPPY TO HELP! THIS APPLIES TO ANY DEVICE, WHEREVER AND
WHENEVER ORIGINALLY ACQUIRED. HOWEVER, IN SPECIFIC CASES, WE RESERVE THE RIGHT TO CHARGE
FOR LABOR, PARTS, AND TRANSIT EXPENSES WHERE APPLICABLE.
RETURN POLICY
THE DEVICE INTENDED FOR REPAIR OR REPLACEMENT UNDER WARRANTY NEEDS TO BE SHIPPED IN
THE ORIGINAL PACKAGING ONLY AND MUST INCLUDE A COMPLETED RMA FORM. XAOC DEVICES CAN
NOT TAKE ANY RESPONSIBILITY FOR DAMAGES CAUSED DURING TRANSPORT. SO BEFORE SENDING
US ANYTHING, PLEASE CONTACT US AT [email protected]. NOTE THAT ANY
UNSOLICITED PARCEL WILL BE REJECTED AND RETURNED!
GENERAL INQUIRIES
FOR USER FEEDBACK SUGGESTIONS, DISTRIBUTION TERMS, AND JOB POSITIONS, FEEL FREE TO CON-
TACT XAOC DEVICES AT [email protected]. PLEASE VISIT XAOCDEVICES.COM FOR IN-
FORMATION ABOUT THE CURRENT PRODUCT LINE, USER MANUALS, FIRMWARE UPDATES, TUTORIALS,
AND MERCHANDISE.