Oberheim ob 1 user manual

Page 1

O BERHE IM
THE 08-] SYNiHesiggg

After you have unpacked your OB-l and placed it on something that will hold it
i a playable position. connect the AC cord to a 117 volt AC line. Locate the Un-Off
switch beside the AC cord. When you turn the unit on, one of the red LED's will light
up indicating which of the program memory sections is active.

Either low or high output jacks may be used for amplification of your signal.
Start with low output since high-out is ZOdb stronger.

Your OB-l comes pre-set with eight factory patches:

T) BASS 5) TALK BOX GUITAR
2) HARMONICA 6) STRING

3) FLUTE 7) HORN

4) ZIPPER 8) STEEL DRUM

You can move from one preset to another by merely touching the capacitive switch
under the appropriate LED light. All rotary contlolsthat do not program have qrev
tops. All switches that appear in the three perfonhance sections below the Oherheim
TradeMark do not program and the VCA On-Off switch is also not programnable. All
Controls in the master Section are programmable with the exception of Tour grey tops;
VCO-l fine tune, VCO-Z fihe tune, VCF fine tune, Volume. A short tuning and set-up
procedure is necessary:

1) VCO-l FINE TUNE 12 OCLOCK

2) VCO-Z FINE TUNE (unison with VCO-l)
3) VCF FINE TUNE " H

A) VCF PERFORMANCE

5) TRANSPOSE SWITCH MID POSITION

6) MANUAL VOLUME 9-12 O'CLOCK

7) VCA SWITCH OFF

The factory programs should now be available. If you experience difficulty in
changing from preset to preset, you might have a low capacitance. Simply usQIyour
thumb to make contact with any part of the metal face plate while you change programs.
Your thumb acts as a ground to the switch.

Now we are going to examinelcvery control available with the 08-1. To simplify
this procedure we will take it one section at a time.

VOLTAGE CONTROLLED OSCILLATOR VCO-l
VOLTAGE CONTROLLED OSCILLATOR VCO-2
VOLTAGE CONTROLLED FILTER VCF
ENVELOPE GENERATORS

PROGRAMMER

PERFORMANCE SECTION

BACK PANEL

KEYBOARD

(NOT U1 5 m N-4
VVvvx-avvv

At this time, activate the manual capacitance switch in the program section;
the red LED beside the switch should light. Now you have access to all controls on
your master panel.

Page 2

VOLTAGE CONTROLLED OSCILLATOR - l

a) FREQUENCY (TUNING): This control changes the initial pitch of VCO-l up to
five octaves in l/Z step increments,.by raising the control from full left to

full right. There is some slack in rotation at the left-most setting,

b) HAVEFORM: Varies VCO-l selected waveform from square to pulse or triangle
to sawtooth. Use in conjunction with waveform select switch to determine the

initial number of harmonics available (raw sound).

c) NAVEFORM SELECT: Selects either pulse-type or saw-type wave. Set left
for saw, right for pulse.

d) FUNDAMENTAL OUTPUT: Passes the output of the oscillator to the VCF section.
Three position switch, ON, half power (-3 db), or OFF.

e) OCTAVE OUTPUT: Passes the subharmonic of VCO-l (one octave below) to the
VCF section.square wave only with three position switch. 0N, half power (-3 db)
or OFF.

f) MODULATION: Using the LFO section as a sole source of signal, rightwards
rotation will cause increasing change in either the waveshape or the frequency
of VCO-l.

g) MODULATION SELECT: Used in conjunction with modulation amount control, this
two-position switch determines what characteristic of VCO-l will be affected.
Left-modulation will drive frequency sharp and flat. Right-modulation will
alter waveshapes, thus, changing the overtone series.

h) CROSSMOD: Allows VCO-Z frequency to modualte VCO-l, thus, changes in the
pitch of VCO-E and will affect the output of VCO-l. Useful for bells, gong.
steel drums, elr. Left-off, right-on.

i) FINE TUNE: A non-programmable pitch adjustment.

VOLTAGE CONTROLLED OSCILLATOR - 2

a) FREQUENCY: Same as VCO-l

b) HAVEFORM: Same as VCO-l

c) WAVEFORM SELECT: Same as VCO-l

d) FUNDAMENTAL OUTPUT: Same as VCO-l
e) OCTAVE OUTPUT: Same as VCO-i

f) MODULATION: Similar to VCO-l control with the addition of another signal
that can be used (VCF envelope) to produce effect.

9) MODULATION SELECT: same as VCO-l.

h) LFO/ENV SELECT: Selects signals from either LFO section of VCF envelope to
modulate VCO-Z left-LEO, right-VCF envelope.