The video above is a quick start guide & overview to one of the most complex and rewarding modules I’ve used. The Benjolin’s main feature is the Rungler, which, in short, is a random stepped voltage that is created by the two oscillators. Any questions you may have about the Benjolin will most likely be answered by James Cigler’s in-depth video below. Reverb was added with Tip Top Audio’s Z5000.
The following is a response I received from Sylvan when I asked specific questions as to how the Rungler and Loop functions worked.
“When the rungler is in loop mode this basically means that the content of the shift register, which consists of the data contents of these 8 stages, are being recirculated or in other words the rungler no longer accepts new data from Oscillator A. Thus, oscillator A will have no effect on the pattern (assuming bmod knob is all the way CCW, otherwise changes in the rate of OSC A will effect the loop speed indirectly). But as you will notice, you still have control over the speed of the rungler pattern through Oscillator B. In sum, the content of the loop is locked down but the speed at which the data stages recirculate is still manipulable.
If you hear a change in the sound of the filter outputs this is because the audio input of the filter comes both from the Rungler and the PWM wave which is derived from the two triangle waves. Thus when the rungler is looping, a change in the rate of oscillator A still affects the PWM’d pulse wave, but not the stepped output of the rungler. In other words, the comparator is only indirectly related to the rungler, the rungler cv affects the PWM output through manipulation of the rates of triangles A and B which comprise the inputs if the comparator and which puts out a pulse each time the voltage level of Triangle A rise and then falls below the level of B.
This is how the Rungler Loop function works: whenever a voltage rises above .7 volts (whether obtained by a CV or the use of the offset knob) the rungler locks into a looping pattern, and conversely when it drops below this threshold the pattern breaks. Thus, running a +cv into the rungler, with or without the offset creates loop-hold patterns. Likewise turning the offset knob clockwise until the the rungler begins looping and then using a negative cv creates loop-break patterns.
The offset can also be used to control when the loop is triggered. Say for example, you’re running triangle wave at 5 volts p/p, without the offset the loop is triggered at +.7 volts automatically, but by turning the offset knob CCW you can lower the cv input so the Rungler Loops at the peak of the wave which would otherwise be impossible.”
James Cigler thoroughly dissects the Benjolin