DUAL ENV is a dual envelope generator. It creates two different envelope slopes that can be clocked and linked together. For example, often one envelope is used for volume/amplitude and the second to modulate signals.
The envelope has five stages:
Attack two-way switch for Keyboard or seq./drum machine called Gate or Trig.
Release - sets decay time of the gate
Traditional ADSR - very static decay pitch
Second Decay knob
‘Break level’ is a secondary sustain level
Modulated with CV - look at an envelope as a wave generator
Release time modulation
Sample and Hold - receives a trigger pulse to measure to input level - also changes the statistics of what is happening - making it independent of the pitch that it is sampling
Interference Pattern to modulate the times of the parameters of the envelope generator
Low LFO frequency overlapping the sample and hold to creates a ‘swing’ effect
Sample and hold normalised to filter modulation
Q: Is the normalisation the same on the Twin Peak as the ‘Dual Env’? - use a plug to normalise -
Disconnect the sample and hold input
The Sample and hold can be clocked with an audio signal by plugging an oscillator audio output into the gate input of sample and hold
Example of using the audio output of an oscillator to clock the sample and hold of the Dual Env.
Example - to modulate 1v oct input using a triangle wave in VCA output to 1v oct
The Rungler concept was originally inspired by the work of composer Jan Boerman.
Q - How can noise be clocked?
A - The noise is clocked using a ‘Linear Feedback Shift-Register Algorithm’ which is a simple 1 bit delay (on/off) across 16 or 32 memory locations. When the clock receives a pulse the data is shift registered in the pipe of the memory location which steps up all values by 1.
Q - How does the random switch work?
A- Pseudo random number generator can be used to produces sequences of numbers using feedback into the data input. When converted to voltages gives a sense of random noise that is basically a calculable stochastic distribution.
The RUNGLER concept is based on simple short delay of 8 or 16 bits that feeds a Digital to Analogue (D to A) converter in order to produce differing voltage levels that are used to modulate, ie the clock of an oscillator. This is demonstrated by feeding the step signal output into the pitch input of a sine wave oscillator to produce a sequence of pitches.
Altering the rate of the signal produces either, singular notes or granular waves. The RUNGLER gives a sense of movement to sound and can be compared to the visual stimulus associated with altering the frame rate of film.