analogue solutions
Leipzig
e&oe (c) 1-1-08
12
LED indicators
Each oscillator has it's own 'frequency' LED. This is taken from the VCO's pitch, but
of course divided down enough octaves so you can see it fl ash!
VCF
The voltage controlled fi lter low pass fi lter (VC LPF) is used to
alter the tone of the signal coming from the mixer output (VCOs/Noise
) and is the heart of what gives an analogue synth its character.
CUT OFF
This sets the cut-off frequency, the point at which the LPF will
start to fi lter-out harmonics.
EMPHASIS
Emphasis (Resonance, Q or Feedback) is a feature of adding
feedback to the fi lter circuit. The output of the fi lter is fed back into
the fi lter input. Emphasis sets the level of feedback. As the control is
increased to higher levels the fi lter will self-oscillate. The oscillation
frequency is set by the cut-off control.
Use Emphasis to alter the tone of the fi lter effect. It can be used
to create 'squiggy' sounds and 'pulse hits'.
KEY TRACK
The pitch CV (CV1) also controls the fi lter-cut off. The KEYTRA-
CL control alters how much this happens. Key Track is sometimes
also known as Key Follow. This is used when you want a brighter
sound as you play a higher pitch, since an increasing pitch means
higher CV1, which in turn increases the cut-off frequency (assuming
the KEY TRACK control is up). This brightening of sound is how real
sound behaves. 'Real' instruments usually sound brighter in their
higher registers.
KEY TRACK can also be used to 'play' the resonance, but set-
ting EMPHASIS to self-oscillate.
ENV1 MOD
This control alters how much the cut-off is modulated by enve-
lope generator 1. Balance this control with the CUT OFF control.
Filtering External Sound Sources
External sound sources, such as vocals, guitars, mixer sends, samplers, etc. can be
sent through the fi lter for extra treatment. Note, mic's and guitars may need pre-amp'ing;
use if the signal is too quiet.
Simply plug the sound source into the rear panel EXT1 socket.
Turn the mixer control EXT/NOISE to EXT, and up to a suitable level.
You may wish to return the VCO1 and VCO2 mixer controls to their centre positions
so the VCOs cannot be heard.
