analogue solutions
Leipzig
e&oe (c) 1-1-08
9
CIRCUITS IN DETAILS
Here follows details on all the sockets and controls, with brief simplifi ed explanations
of what the circuits do. We have not gone into technical details on how and exactly what
each circuit does but tried to explain each control's function and effect.
Anyone who has used synthesisers before should be familiar with the terms used and
therefore be able to predict their behaviour and how they affect the sound. The best way
to learn how to use Leipzig is to go straight ahead and play with it. Reading of this manual
may only be neccessary for fi ner operational detail.
VCO & 2
The voltage controlled oscillators (VCOs 1 and 2) produce
the raw audio waveform usually used as the initial source for
sound creation. They provide cyclic audio waveforms that can
be pitched. VCOs usually receive treatment from the VCF to turn
their basic tones into pleasant sounds.
TUNE
Two independent TUNE controls for the oscillators. Controls the
course pitch of the VCO. Range is about +/- 2 octaves.
GLIDE
Two independent GLIDE controls (portamento) for the oscil-
lators. Each time you play a new note, the pitch will glide from the
last note to the new note. The GLIDE control alters the speed.
At minimum there is no glide.
Pulse Width
(Just below VCO1 GLIDE control). For VCO1 only. This alters the pulse width for
VCO1's square wave (alters the 'duty cycle'). If you do not understand this, don't worry
about it! Just turn it and hear how the tone changes.
SYNC
VCO2 only. This switch routes a sync signal to VCO2. Oscillator sync is where a
master signal (selected by the switch) will reset the waveform of a slave signal (VCO2 in
this case) each time the master waveform starts a new cycle.
Try the different settings and listen to the effect. You may have to modulate the pitch
of either VCO1 or VCO2 to enhance the effect. There is a balancing act between the pitch
