4ms Shifting Inverting Signal Mingler

The SISM is a 4-channel voltage manipulator that can scale, invert, attenuate, shift (dc offset), mix, split, and slice your CV and audio signals.

A plethora of red and blue LEDs (14) show exactly what each channel and output jack is doing: red = negative voltage, blue = positive.

Each channel is independent and has an input jack, output jack, a knob for attenuating/inverting (Scale), and a knob for applying positive or negative DC offset (Shift).

Features

• Four independent voltage processor channels, with four mix/mingle outputs
• Each channel has:
  • Input jack
  • Scale knob (from inverted unity, to zero, to unity
  • Shift knob (adds/subtracts DC offset from -9V to +9V)
  • Output jack
  • Red and blue LEDs to indicate + or - voltage, as well as intensity
• MIX jack outputs sum of all channels
• MIX SWitch jack outputs sum of all channels with nothing plugged into their output jack
• + SLICE jack outputs positive portion of mix (voltages greater than 0V)
• - SLICE jack outputs negative portion of mix (voltages less than 0V)
• Red and blue LEDs on all four mix/mingle jacks display what the signal is doing

Advanced features:

• Channels 1+2 and 3+4 are normaled together on the input, so plugging into Channel 1 (or 3) will split the signal: A jumper can disable this normalization
• Scale knob has three ranges that are selectable with jumpers:
  • Bi-polar: -1x to +1x (inverting unity to unity) --default
  • Uni-polar: 0 to +1x (level fader)
  • Boost: 0 to 2x (twice the voltage gain)
• Input Header (2x4) for connecting the output of a QCD or QPLFO to the SISM's inputs. Plugging into the input jacks overrides the signal on the header
• Output Header (2x4) for connecting to the input of a VCA Matrix or other compatible module
• PAD breakout header (2x4) for connecting to a breakout module that applies a pre-set pad (attenuation) to each channel.

Video