The Kassutronics Slope is a truly versatile eurorack module that should be included in any creative modular setup. Inspired by the legendary Serge Dual Universal Slope Generator, the Slope is an 8HP voltage-controlled slew limiter and modulation source that offers far more functionality than its compact design suggests.
At its core, the Slope module is a single slope generator that uses only through-hole components. The module provides basic slew limiter functionality, but it also has extra controls that make it a versatile modulation source. For example, the loop switch can turn the Slope into an oscillator capable of generating minute-long LFO cycles up to kHz range. The gate input and sustain control allow for voltage-controlled ADSR envelope generation, and the end-of-rise and end-of-cycle outputs enable voltage-controlled pulse timing functions.
Additionally, the Slope's rise and fall sections have independent shape controls that can vary between exponential growth, linear, and exponential decay (sometimes called log) shapes. This feature offers even more flexibility to craft truly unique modulation contours.
One of the most attractive aspects of the Slope is its sleek and compact design. Despite its small size, it offers an impressive range of functions that make it a valuable addition to any modular synth rig. The use of only through-hole components means that it is also a module that can be built by enthusiasts.
In summary, Kassutronics Slope is a formidable eurorack module that combines the functionality of a voltage-controlled slew limiter and modulation source. Its ability to generate complex ADSR envelopes, create voltage-controlled pulse timings, and produce LFO cycles make it a truly versatile module. Its compact size and through-hole components make it a great choice for enthusiasts looking to build their own modules.
Example Usage
If you're new to using a voltage-controlled slew limiter and modulation source module like the Kassutronics Slope, a simple way to start experimenting is by using it as a morphing LFO. Connect the output of the Slope to a filter or oscillator and adjust the rise and fall shapes to create smooth, evolving waveforms. Then, use the loop switch to cycle through the LFO waveforms at different rates. With practice, you can further explore the Slope's versatile capabilities to create unique modulation sources for your modular setup.
An intermediate-level usage example of the Kassutronics Slope module is to use it as a complex modulation source for a filter cutoff frequency. Patch a slow LFO waveform to the rise input and a slightly faster one to the fall input. Then, patch the end-of-rise output to the cutoff frequency input of a low-pass filter and the end-of-cycle output to the modulation input of the same filter. Adjust the shape controls to create dynamic and evolving filter sweeps that respond to the input signals. Use the sustain control and gate input to trigger the modulation source on and off, or use it as an envelope generator to affect other parameters in the patch. This setup allows for intricate and continuously changing filter movements that can add movement and interest to any patch.
Further Thoughts
One of the most powerful features of the Kassutronics Slope module is its ability to function as a complex modulation source. For example, connecting the Slope's gate input to a sequencer or keyboard trigger allows it to function as an envelope generator, with voltage-controlled attack, decay, sustain, and release stages. By adjusting the end-of-rise and end-of-cycle outputs, you can precisely control the timing of gates and triggers in your patch, allowing for intricate rhythmic patterns and highly expressive performances. Additionally, the Slope's loop switch can transform it into a powerful oscillator, capable of generating both audio-rate and low-frequency signals that can be used as the basis for complex soundscapes or rhythmic sequences. Whether you're a modular synthesis veteran or a newcomer to the format, the Kassutronics Slope is an essential tool for creating dynamic and expressive patches that push the boundaries of what's possible with voltage-controlled slewing and modulation.