Doepfer A-110 Standard VCO User Manual download pdf (Page 7)

doepfer

System A - 100

VCO

A-110

5. In / Outputs

! SYNC

Socket ! is the Sync Input for the VCO. What sync

means in this context is that the waveform of one VCO

("Slave") is locked to the waveform of another VCO

("Master"), by connecting the audio out of the master

VCO to the Sync input of the slave VCO.

In the A-110, this is designed as "Hard Sync". Check

out the following example (see Fig. 7): the slave

VCO’s sawtooth waveform is always reset to the begin-

ning of a cycle whenever the master VCO’s sawtooth

waveform starts a new cycle. If f

- the frequency of

the master VCO - is higher than f

(the slave’s fre-

quency), then the slave’s pitch is synced exactly to the

master’s (Fig. 7a).

In the opposite situation, where the master VCO’s pitch

is lower than the slave (f

< f

), the master again

imposes its frequency on the slave (Fig. 7 b: cycle T

exactly matches the master VCO’s cycle). But at the

same time, harmonic sidebands are produced by the

slave VCO’s changed waveform, which can create

interesting timbral effects.

Fig. 7: Hard Sync on the A-110

" CV 1 • § CV 2

Sockets " and § are CV inputs for controlling the

VCO’s frequency (pitch). The voltages at these inputs

are summed. The inputs follow the 1V / octave rule

exactly.

Master

Slave

with

Hard Sync

f < f

Master

Slave

with

Hard Sync

f > f

1 2 3 4 5 6 7 8 9 10 11 12

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Doepfer A-110 Standard VCO User Manual Page 7

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