This is a sequencer which uses the position of four knobs to determine all voltages and gate on/off settings for a sequence of up to 32 steps.
This is a PCB only (including programmed PIC) suitable for multiple formats.
The design goal when making the 4 Knob was to generate lots of output from a very minimal amount of input and control. The initial prototype only consisted of a clock input and the 4 knobs as input/control but was able to output two voiced 32 step sequences. More controls were added to either filter this output or help it work in sequence with other parts of a modular system.
The way the sequencer works is that it reads the positions of the four knobs and converts these positions into numbers. It then uses these numbers to determine the number of steps in a sequence (2 to 32 is step range) and what each of the four outputs of the sequence should be doing on each of those steps. Each step has a specific set of instructions, like “Add knob 1 to knob 3 and use that number for the output of Voltage 1. Then check if the third bit of knob 4 is on, if so turn on Gate 2.” This means that the sequences are not random, though the changes are difficult to predict.
CONTROLS
INPUTS
All inputs are for timing purposes, they can be used with the outputs of LFOs/VCOs/Clock Generators/Gate/Trigger signals. They all react when the input goes above zero volts.
OUTPUTS
Brand | Barton Musical Instruments |
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Additional Resources | Build Guide |