Osc; Osc 1 Pitch Mod Fader - Behringer DEEPMIND 12 User Manual

52 DeepMind 12 User Manual

8.3 OSC

The Oscillators (OSCs) have a completely analog implementation. The signal path
of the waveform is purely analog circuitry. The pitch of these analog oscillators
is controlled digitally to ensure superior tuning accuracy and stability across the
entire range of playable notes.
OSC 1 - This dual oscillator generates two diff erent waveforms - one SAWTOOTH,
and one SQUARE. The waveforms can be used independently or together to create
harmonically rich content.
Features include pitch modulation of both the sawtooth and square waveforms,
and pulse width modulation of the square waveform.
OSC 2 - This single oscillator generates a SQUARE waveform.
Features include pitch off set, independent level control, pitch modulation and
tone control modulation of the square waveform.
NOISE - This generates a NOISE waveform. The NOISE generator is a completely
analog implementation and produces pink noise with a gentle roll off of
lower frequencies.

8.3.1 OSC 1 PITCH MOD FADER

The OSC 1 PITCH MOD fader controls the amount of PITCH MODULATION applied
to the OSC1 waveforms. The PITCH MODULATION SOURCE is selected in the OSC
EDIT page described later in this section. Pitch modulation is often used to create
a vibrato eff ect, but can be used in many other ways. The range of modulation is
very wide, allowing both traditional and creative modulations.
Controlling the frequency using an external signal is a form of frequency
modulation (FM), however as FM is more commonly used to describe the
use of an audio oscillator modulating another audio oscillator the use of the
term PITCH MODULATION is preferred in this instance.
Note: Because the DeepMind 12 LFO can reach well into the audio range
(1280 Hz) it is possible to create traditional frequency modulation (FM) when the
LFO is used as the source for PITCH MODULATION of the OSCs.
The diagram below shows the waveforms obtained with LFO control of OSC 1:
OSC 1 PITCH MODULATION (LFO AS SOURCE)
OSC 1 (SAW)
LFO (SIN)
PITCH MOD
OSC 1 (SQR)
LFO (SIN)
PITCH MOD
As you increase the amount of PITCH MODULATION the variance in the pitch of
oscillator will increase resulting in larger increases and decreases as
demonstrated in the diagram below. The PITCH MODULATION will aff ect both the
SAWTOOTH and SQUARE waveforms produced by OSC 1.
OSC 1 PITCH MODULATION AMOUNT (LFO AS SOURCE)
OSC 1 (SQR)
LFO (SIN)
PITCH MOD LOW
PITCH MOD MED
PITCH MOD HIGH
The OSC 1 PITCH MOD range is from 0.00cents to 36.0 semitones. The default OSC
1 PITCH MOD setting is 0.00cents.
The OSC 1 PITCH MOD fader has a non-linear response which gives more
resolution at smaller settings, to allow delicate or fi ne use of the modulation. The
response of the OSC 1 PITCH MOD fader is shown below:
PITCH MOD Fader Response
36
0
0
Fader Position
10