Make Noise DPO Manual

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Make Noise DPO Manual Manual pdf 11 page image

11Mod BusThe internal Mod Bus Source is hardwired for VCO A Sine wave, with the power to use any external source by patching to the EXT.Source Input. The internal Mod bus system makes use of the Normalization Switch found on the mini-jacks, so with nothingpatched to the Shape, Angle, and Fold CV inputs the associated attenuator sets the final amount of modulation applied to thedestination. As you increase the Index level, the amplitude of VCO A Sine bused to the Shape, Angle, and Fold jacks is increased.Therefore, you could have different amounts of modulation at each of the destinations (Shape, Angle, Fold).TimbreThe 3 parameters that are modulated by the Mod Bus shape the signal that is output at the Final Output. The top-mostparameter in the Timbre section, Shape, adds higher order harmonics to the signal by morphing from Sine (full counterclockwise) to Spike (12:00) to Glitched Triangle (full clockwise) while at the same time inducing phase reversal and amplitudemodulation around the 12:00 range of the parameter value. This might sound like an odd collection of waveforms and functions,but the selection is quite useful.The Sine wave is the classic waveform that would feed a wave folder, as utilized in both the Buchla 259 and the Buchla MusicEasel Timbre circuits. Since wave-folding introduces lower order harmonics to the signal, the extremely low amount of harmonicsin a Sine wave allows the circuit to do its job perfectly, resulting in smooth and glitch-free folding of the waveform.The Spike shape on the other hand is rich in higher ordered harmonics and morphing from Sine to Spike without any folding ofthe waveform (Fold set 7:00 to 8:00) provides something like the effect of high pass filtering. The Spike waveform is useful inproviding a strong group of harmonics for the ear to follow while modulating the Angle parameter or utilizing the lower octaves(mix with the Sine Output to brighten bass sounds). The Spike wave shape is thin and resonant sounding, making the Fold circuitfeel almost anemic (in contrast to being fed a full blooded Sine shape).The Glitched Triangle brings the combination of the strong Harmonic that makes the Angle modulations so animated and thegirth of the Sine wave that gives the Fold circuit some fat to chew, er Fold!MOD BUS and Timbre Shaping Sections:

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