User guide
10
Oscillator SYNC Modes
The oscillators can be reset, or synchronized, whenever a synchronizaon event occurs. A synchronizaon
event happens whenever the voltage at the SYNC input jack rises above about 0.2 volts, and also whenever the
phase of the internal synchronizaon oscillator passes zero when the INT. SYNC mode is enabled. The synchro-
nizaon oscillator runs at the same nominal frequency as oscillator 1 (except that it is not aected by frequen-
cy modulaon or detuning). The specic behaviour of the oscillators in response to a synchronizaon event
depends on the currently selected SYNC mode, as described below and shown in the gure on the next pages.
Press the SYNC/PULSE/STEP buon to acvate the rotary encoder for selecon of the SYNC mode. The selected
SYNC mode will be shown in the upper row of the LCD display.
There are 8 dierent SYNC modes that can be selected:
HardSync - in this mode the phases of both oscillators 1 and 2 are reset to zero when a synchronizaon
event occurs. This is most common type of synchronizaon eect found in other oscillator modules.
SoSync - in this mode the phases of both oscillators 1 and 2 are reset to zero when a synchronizaon
event occurs but only when the oscillator waveform is in the rst quarter of its cycle (i.e. where the phase
is between 0 and 90 degrees). Thus the oscillators might not be reset on every synchronizaon event. This
gives a somewhat noisier and more errac sound than hardsync.
Rev Sync - in this mode the direcon of the waveform is reversed when a synchronizaon event occurs.
For example, a rising sawtooth waveform will become a falling sawtooth waveform. This tends to provide
a rather smooth sound, useful for basses, especially when INT SYNC is enabled.
Hold/1sh - in this mode the output of oscillator 1 switches between being held constant (freeze eect)
or running free on each synchronizaon event. This is useful to provide choppy gang eects with low
frequency SYNC inputs. Oscillator 2 will go through one complete cycle on each synchronizaon event.
BumpSync - in this mode the phase of oscillator 1 is ‘bumped’, or oset, by 1/4th of a cycle (90 degrees)
and the phase of oscillator 2 is bumped by 1/8th of a cycle (45 degrees) whenever a synchronizaon event
occurs.
2=1 Sync - this mode operates in the same way as HardSync mode, except that whenever the output of
oscillator 1 is equal to the output of oscillator 2 an addional synchronizaon event is created that is sent
to oscillator 2 only. The typical result is to create ‘chirps’ in oscillator 2 where its waveform chases that of
oscillator 1, being repeatedly reset with shorter and shorter me intervals unl it catches up.
1=2 Sync - this mode is similar to 2=1 Synch mode except that the addional synchronizaon event is sent
to oscillator 1 only. In this mode the ‘chirps’ are created in oscillator 1.
Sync O - in this mode the synchronizaon events have no eect on the oscillators. It can be useful when
the SYNC input is used to step the presets in PRESET STEP mode to avoid the transient that might other-
wise occur, and also in CHORD mode to prevent the phase alignment of the 8 oscillators (unless you want
that eect!).
Examples of the response of oscillator 2 to synchronizaon events in each sync mode is shown in the next two
pages. The yellow arrows indicate the me of occurence of synchronizaon events.