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OSCILLATOR CONTROLS (CONTINUED)
HARD SYNC
This button locks oscillator 2’s phase to oscillator 1, eliminating any phase differences between them.
When both oscillators are in sync, each time that oscillator 1 begins a new cycle, it forces oscillator
2 to begin its cycle at the same instant, regardless of whether its previous cycle is complete. As a
result, hard sync forces oscillator 2’s waveform to take on a different shape, typically one with greater
harmonic complexity. Because oscillator 2 is in sync with oscillator 1, their combined harmonic content
depends on their pitch relationship, so that changing oscillator 2’s frequency will have an immediate
effect on timbre. For that reason, modulating oscillator 2’s frequency opens up some outstanding
waveshaping opportunities when HARD SYNC is engaged.
NOTE: If oscillator 1’s frequency is higher than oscillator 2’s, oscillator 2 will be unable to complete its
cycle, resulting in little or no output from oscillator 2.
KB RESET
When engaged, the keyboard reset function forces the audio oscillators to simultaneously begin their cycles
whenever you play a new note. The result is a well-defined leading edge to sounds with a hard attack. This can
cause a small click or pop in the sound. To minimize this effect, set a short Release time on the Amp Envelope.
DUO MODE
When DUO MODE is engaged, the Sub 37 has the ability to control the pitch of OSC 1 independently of
OSC 2. This behavior is based on oscillator KB CTRL settings.
KB CTRL
This button is used to determine how OSC 2 responds to the keyboard when in DUO MODE.
HI: OSC 2 follows the highest note played, while OSC 1 follows the lowest note.
LO: OSC 2 follows the lowest note played, while OSC 1 follows the highest note.
OFF: OSC 2 drones and does not follow the keyboard. The FREQUENCY control knob’s range is
extended to +/- 3 octaves, so you can set a constant pitch for OSC 2 across a wider range.
FREQUENCY
This knob is used to fine-tune oscillator 2’s pitch within its selected range. The FREQUENCY knob’s range
is seven semitones lower or higher than its center position. At its center position, oscillator 2 is tuned to
oscillator 1. Turning it just slightly out of tune with oscillator 1 can yield interesting detuned or phasing
effects. Turning the knob fully clockwise will create a perfect fifth interval against oscillator 1 (assuming
that they’re both on the same octave) allowing you to play “power chords” with just one finger.
BEAT FREQ: Use the BEAT knob to set the beat frequency of oscillator 2 against oscillator 1. The
range is plus or minus 3.5Hz with no detuning (0Hz) in the middle. This parameter creates a linear
constant detuning of oscillator 2 relative to oscillator 1 so that oscillator 2 is always detuned by
the same number of cycles per second (Hz) regardless of the musical pitch. The result is a musical
detuning effect which phases or “beats” at a consistent rate on every note.
By contrast, the OSCILLATOR 2 FREQUENCY knob detunes oscillator 2 by musical cents, where the
rate of beating between oscillators is halved or doubled as you play an octave lower or higher in pitch.
NOTE: For this reason, if you want a constant beat frequency at all pitches, make sure that the
OSCILLATOR 2 FREQUENCY control is centered. If you want near-absolute unison between oscillator 2
and oscillator 1, make sure that the BEAT FREQUENCY control is also centered.
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