This module – a recreation of the classic Serge Wave Multipliers (VCM) module from the early 80s, adapted partially to the Eurorack format – contains a nicely-rounded, tube-like clipping or saturation; a wave folder that emphasized the odd-numbered harmonics; and a three-stage full wave rectifier that emphasizes the even harmonics. The video in this article focuses on the wave shaping section, and compares its analog sound to the digital one included in the Expert Sleepers Disting; I also discuss matching Eurorack levels to work with Serge-inspired modules.
One of the potential challenges of using a modular synth is keeping multiple VCOs in tune with each other as well as external instruments as you play up and down a scale. Most VCOs have trim controls to improve their tracking, but they can occasionally be frustrating to use: They may require you to remove the module from the case to access them, or the manufacturer might have not have used high-precision multi-turn potentiometers for the trimming controls. Therefore, I’ve added several AJH Synth V-Scale Variable Precision Buffers to my modular cases, and have been happier for it. What sets it apart is that 4 of its 5 outputs have high-precision trimmers accessible from the front panel, allowing you to improve the tracking of connected modules like VCOs and resonating filters.
A nice option for an analog VCO to add to your system is the Intellijel Dixie II+: it’s small, has excellent tracking, supports linear and exponential FM as well as PWM and hard sync, and has six different waveforms. In this movie, I demonstrate creating a hard sync patch with the Dixie II+. For those who wonder exactly what’s going on when you use sync, I focus heavily on what’s happening with the waveform output. I also look at the Dixie II+’s unique Flip function.
There are a lot of voltage-controlled stereo mixers; perhaps lost in the shuffle is the Verbos Scan & Pan. It features four input channels with both voltage and manual control of level and panning per channel, as well as manual control of a huge amount of input gain. In this video, I demonstrate using the Scan portion of this mixer to combine the different waveforms available from an Intellijel Dixie II+, including its sub-octave output plus its sine wave that is saturated by the Verbos. I particularly have fun using an envelope to articulate that mix per note.
Most know the Moog Mother-32 as being a neat little semi-modular synthesizer. However, it also contains a step sequencer with lots of nice options. While you’re paused on a note during the creation of a sequence or while editing it after the fact, you can also edit duration, glide, ratcheting (repeats), accents, and rests for that step. In this post, I’ll go over how to access those options and show you how to program ratchets and glides.