User guide

10
Oscillator SYNC Modes
The oscillators can be reset, or synchronized, whenever a synchronizaon event occurs. A synchronizaon
event happens whenever the voltage at the SYNC input jack rises above about 0.2 volts, and also whenever the
phase of the internal synchronizaon oscillator passes zero when the INT. SYNC mode is enabled. The synchro-
nizaon oscillator runs at the same nominal frequency as oscillator 1 (except that it is not aected by frequen-
cy modulaon or detuning). The specic behaviour of the oscillators in response to a synchronizaon 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 buon to acvate the rotary encoder for selecon of the SYNC mode. The selected
SYNC mode will be shown in the upper row of the LCD display.
There are 8 dierent SYNC modes that can be selected:
HardSync - in this mode the phases of both oscillators 1 and 2 are reset to zero when a synchronizaon
event occurs. This is most common type of synchronizaon eect found in other oscillator modules.
SoSync - in this mode the phases of both oscillators 1 and 2 are reset to zero when a synchronizaon
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 synchronizaon event. This
gives a somewhat noisier and more errac sound than hardsync.
Rev Sync - in this mode the direcon of the waveform is reversed when a synchronizaon 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 eect)
or running free on each synchronizaon event. This is useful to provide choppy gang eects with low
frequency SYNC inputs. Oscillator 2 will go through one complete cycle on each synchronizaon event.
BumpSync - in this mode the phase of oscillator 1 is ‘bumped’, or oset, 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 synchronizaon 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 addional synchronizaon 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 unl it catches up.
1=2 Sync - this mode is similar to 2=1 Synch mode except that the addional synchronizaon event is sent
to oscillator 1 only. In this mode the ‘chirps’ are created in oscillator 1.
Sync O - in this mode the synchronizaon events have no eect 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 eect!).
Examples of the response of oscillator 2 to synchronizaon events in each sync mode is shown in the next two
pages. The yellow arrows indicate the me of occurence of synchronizaon events.