ADDAC System 403 VC Time Signature Clock Sources

A digital clock for modular systems, built to divide time across bars, beats, and odd groupings.

Overview

The ADDAC403 VC Time Signature Clock Sources is not a rhythm generator in the usual sense. It is a clock source for modular time, made for complex sequencing. ADDAC System announced it as the "long-awaited" Eurorack module, and it fills a gap in the ADDAC400 Series. It does not generate sound. It manages multiple rhythmic layers at once and divides time in ways that go beyond the standard quarter-note pulse. It is 16HP and 4cm deep, which is compact by Eurorack standards. The power draw is 140mA on +12V and 40mA on -12V, which suggests a lot of internal processing, likely from the digital core and drift compensation circuitry.

Specifications

Manufacturer	ADDAC System
HP	16HP
Depth	4cm deep
Power Consumption	140mA +12V, 40mA -12V
Outputs	8 independent trigger outputs
Features sections	ODDS. BARS. BEATS. TIME
Clock description	extremelly stable digital clock with over time drift compensation and adjustable to any Beat per Minute [BPM] up to 1 decimal

Key Features

Extremely Stable Digital Clock with Drift Compensation

The ADDAC403 uses a digital clock engine designed for long-term stability. That matters in a modular system, because timing drift can unravel tightly synced sequences. Analog-centric Eurorack clock sources often rely on simple oscillators prone to thermal or voltage fluctuations. BPM can be adjusted to a single decimal place (e.g., 120.5 BPM), which allows micro-tempo adjustments for matching external gear or creating subtle rhythmic tension.

ODDS. BARS. BEATS. TIME Sections

The module has four labeled sections. The fact sheet does not detail what each one does, but the names imply a hierarchy of time. "TIME" likely sets the master tempo. "BARS" handles bar-length divisions (e.g., 1-bar, 2-bar pulses). "BEATS" manages beat subdivisions (quarter, eighth, sixteenth notes). "ODDS" probably generates triggers based on odd-numbered groupings (triplets, quintuplets, etc.). With this structure you can pull out patterns like a downbeat every four bars or a syncopated triplet pulse without external dividers or logic modules, which simplifies patching.

8 Independent Trigger Outputs

There are eight separate trigger outputs, so one module can drive multiple destinations at the same time. Each output can presumably be assigned to a different time division (e.g., one for bar resets, another for beat pulses, another for odd-meter accents). That cuts cable clutter and improves system reliability. It is useful in large systems where multiple sequencers, envelope generators, or drum modules need precise, phase-aligned timing.

Historical Context

The ADDAC403 was announced as an addition to the ADDAC400 Series, and the manufacturer called it their "long-awaited" Eurorack clock solution. Many clock modules appeared earlier in the Eurorack boom. The 403 came later and focused on metric complexity rather than basic tempo generation. It suits composers working with asymmetrical forms and evolving time signatures.

Collectibility & Value

Current market listings vary widely in price. A new unit was listed for $562.12 on Reverb, while Modulargrid reports an MSRP of $413. Canadian retailer Nightlife Electronics priced it at CAD$625.00, which points to regional markup differences. At the time of documentation, the module was available on pre-order, indicating limited initial availability. No original launch price or production run details are confirmed.