User Guide
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UTILITIES
The Utilities section imbues Grandmother with a series of tools that are key to the
exploration of modular analog synthesis. A four-point mult, high pass lter, and
bipolar attenuator are included as non-wired, patchable resources.
MULT
The MULT consists of four jacks wired together in parallel as a way of
sharing and distributing control signals. For example, the S/H OUT of the
MODULATION generator could be connected to the MULT, where it could
then be sent to three different locations. The MULT jacks can also be used
to safely mix two audio signals together so that the combined audio signal
can then be sent to a single audio input.
NOTE: Only audio signals may be merged using the MULT jacks, and only
audio signals that are AC coupled. These signals include OSCILLATOR 1 WAVE OUT, OSCILLATOR 2
WAVE OUT, FILTER OUT, HIGH PASS FILTER OUT, REVERB OUT, and EURORACK OUT.
HIGH PASS FILTER
Grandmother contains two independent lters: a Voltage Controlled Low Pass
Filter, and this static -6dB/Octave High Pass Filter. Unlike the Low Pass Filter,
the High Pass Filter must be patched to become part of the audio path – but
there are many possibilities. The HIGH PASS knob sets the Cutoff frequency of
the High Pass Filter. Frequencies and harmonic content above the HIGH PASS
knob setting are free to pass, while frequencies below the HIGH PASS knob
setting will be diminished at a rate of 6dB per octave.
TIP: Try patching the WAVE OUT of Oscillator 2, into the INPUT of the High Pass Filter. Then patch the
OUTPUT of the High Pass Filter into the OSC 2 IN jack of the Mixer. Now the tone of Oscillator 2 can be
shaped independently of Oscillator 1.
ADVANCED TIP: Patch the output of Oscillator 2 into the High Pass Filter, and then patch the output
of the High Pass Filter into one of the MULT jacks. Next, patch the output of the Low Pass Filter into
another one of the MULT jacks. The two audio signals are now merged using the Mult. From here,
patch out of a third MULT jack into the VCA IN jack in the Output section. You are now independently
processing each oscillator through its own lter.
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