has a long history in electronic music- traditionally the most versatile voltage-controlled
filter at any analog synthesist's disposal. there were several classic design
examples and variants produced throughout the heyday of analog synthesis, such
as those implemented in the Oberheim SEM, the EDP Wasp, and the fabled,albeit
lesser known filters such as the famous Serge filters and Arp 1047; the classic
SVF configuration is simple and versatile- with several different filter responses
available simultaneously 'for free' by nature of it's design with no elaborate
mixing schemes. traditionally there have been some considerations when designing
a wide-range filter with variable Q using this topology, for instance, relative
instability/ generally poor sound and behaviour at very high Q, many designs
get around this by limiting the maximum Q available, among other things. those
that are designed to allow for self-oscillation will often become unstable at
the threshold and have inconsistencies initiating or mantaining oscillation
across the entire audio range.
the Toppobrillo Multifilter is a new/ traditional state-variable design based
on a great modern quad VCA chip, the SSM2164. this, in part, helps make the
Multiflter what it is, a clean, quiet, stable and very controllable filter at
it's core, without limiting its palette, well suited for processing anything
you can run through it. much attention was paid to the range and feel of the
controls, inputs and overall usability, including all options standard and more;
a very versatile processing tool with amazing sound in a small package.
outputs: -12dB/Oct Lowpass, Hipass; -6dB/Oct Bandpass and Notch
-Notch "Balance" control dials in the H/L ratio with constant power design
-voltage-controlled resonance from none to oscillation
over entire range; ~15-15kHz
-calibrated 1V/Oct input; tracks ~4 octaves
-CV input with reversing-attenuator
-voltage-controlled input gain available at the main signal input. 'overdrive'
available for extra processing
-user-selectable gain mode; "standard" or "gain compensated"
via special gain-compensation loop
-user-configurable "Aux" input; either a 2nd audio input or a 2nd
-25mA average current draw