One synthesizer voice of the PERfourMER is buit up in a classic way (VCO-VCF-VCA) and starts with a VCO with sine, triangle, pulse and sawtooth as waveforms and additional noise. The frequency of the VCO can be modulated up- or downwards by the envelope generator. The LFO can be routed to the pulse width and/or the frequency. The VCO has portamento (glide), a rotary octave switch and a tune control.
The signal then is processed by a 24dB lowpass filter with resonance and a VCA. External audio singals can be fed tinto the filter section which turns the Perfourmer into a quad filter bank with four filters, LFOs and VCAs.
Oscillators and filters can not only be modulated as usual by LFOs and ADSRs - frequency modualtion by adjacent voices is also possible which provides drastic FM sounds. Adjacent oscillators can be synchronized in addition to FM.
LFOs feature the waveforms sawtooth/square (switchable), sine as well as SandH and can be synchronized to the MIDI clock or to the internal clock generator. LFOs 2, 3 and 4 can be synced to LFOs 1, 2 and 3. In MIDI sync mode the rate control doesn't set the LFO speed but the clock divider factor, in LFO sync mode it sets the LFO phase! This is a great feature for complex rhythmical modulations!
The four voices can be used as four independent monophonic syntheiszers. Besides of that there are different modes like unisono, monophonic with rotating voice assignment, two four-voice polyphonic modes and two interesting two-voice polyphonic modes.
For "true polyphony" you´ll have to set each voice exactly the same... but you don´t have to as this will result in polyphonic sounds with totally different flavors. Each voice has a panorama ontrol in addition.
A 440Hz generator makes tuning the PERfourMER an easy task.
This version has four CV inputs and four gate inputs e.g. a CV/Gate socket pair per voice. This way it is possible to play the synthesizer entirely with control voltages.
MIDI In and Thru
mains inlet for 90V-240V AC (50/60Hz)
Audio outputs left and right
front (for each voice):
external audio input / VCO direct out
individual voice output / insert
ca. 43.5 cm x 43 cm x 12 cm rugged metal case for desktop use. Can be rack mounted because rack ears are supplied.