The module is split into 2 parts, a basic sine oscillator, and a multi frequency oscillator. There is no internal prepatching allowing multiple operation modes: linear FM in four quadrants (also called through zero FM) and as well as independent patching. The origins of this technology are in analog computation and the module presents itself to the user accordingly.
The variable harmonic oscillator has 2 outputs, F(X) and ΣF(X)dt, which are roughly equivalent to the 0 and 90 degree phase shift between Sine and Cosine. The frequency content of the output is made up of a group of sine waves whose harmonic relationship and amplitude is determined by the Evolve control. This parameter behaves more like a tuning or sync control than a digital wavetable oscillator, and there are settings that will collapse the wavefunction (temporarily).
Each oscillator has two 1v/Octave inputs dedicated to it that are summed together, under the row of 4, the 2 on the left are for the Sine oscillator and 2 on the right are for the variable harmonic. The outermost inputs on each side have a switch underneath that can invert the signal (so the values from your sequencer are subtracted instead of added). The Evolve harmonic control also has a calibrated 1v/oct input with switch (be aware the Evolve 1v/oct input cannot accept negative voltages, negative voltages can only be accessed by using the panel switch to invert a positive voltage internally).
Successful FM patches may involve using the on board multiple jack to control several aspects of the voice in parallel, for example applying the output from the sequencer to the carrier and modulator will give the same results that are found in classic FM synths like the DX7 and software based on them. An additional sequencer controlling the carrier or the modulator can dynamically vary the ratio.
The carrier oscillator is relatively limited in it’s range compared to other analogue oscillators, working at a fundamental frequency of 1hz to 6khz . Harmonic control allows output frequencies many octaves above this.
The module exists beyond the limits of analog circuitry, where non-linearities, offsets, multiple feedback paths can make the oscillator unruly, deviant. Be aware that this is experimental technology for fearless exploration.
Current consumption: +/-250mA. Operation voltage is +/-15V DC
Processing resolution: theoretically infinite.
Safe studio practice for working with electronic devices (moreso those in metal casing) necessitates 0V / signal ground on the power supply being linked to mains earth. Hinton Instruments Full Power PSU exceeds the necessary requirements for a low noise, reliable and safe supply.
Output impedances 100 ohm. Input impedances for audio and ordinary control are 10k ohm. 1v/oct are many Gigohm.
Audio output voltages are roughly +/-10V (20V peak to peak).