Introduction
Congratulations on your purchase of an Expert Sleepers “Lorelei”. Please read this user manual
before operating your new module.
Lorelei is a VCO (Voltage Controlled Oscillator) with quadrature sine outputs, waveshaping, and
sync/cross-modulation options.
The module has three waveform outputs, all afected by the same waveshaping controls (a front
panel knob and a CV input). The frst ofers a variable pulse width square wave. The remaining
two ofer waveforms based on quadrature (i.e. 90 degrees out of phase) sine waves. The
waveshape control progressively turns the frst sine output into a triangle-like waveform; the
second sine output becomes a saw-like waveform.
The cross-modulation input is somewhat like the sync input found on more conventional VCOs,
but it has more nuances of operation allowing for a wider choice of sounds.
The module is 100% analogue, using discrete transistor OTAs.
Installation
House the module in a Eurorack case of your choosing. The power connector is 16-pin
. If using the power cable supplied with the module, the red edge of the cable is closest
to the bottom edge of the PCB, and carries -12V. ("-12V" is marked on the PCB itself next to this
end of the connector.) Be sure to connect the other end of the power cable correctly, again so
-12V corresponds to the red stripe on the cable.
1 http://www.doepfer.de/a100_man/a100t_e.htm
