Doepfer A-101-2 Vactrol LPG

Modular exclusive

Let's go organic!

Ever since the low pass gate was invented by Don Buchla for his 200 series instruments in the early 1970s, low pass gates have been heralded for their ability to add a lifelike and organic response to modular synth patches.

They work by applying an envelope to a low pass filter with its 0-voltage cutoff frequency way below audible range, so when the envelope is down, the 'gate' is closed. As a note decays, its high frequencies die soonest – just like most acoustic sounds.

The use of a vactrol, or light-based sensor, like those used in optical compressors, lend this design even more lifelike and musical response.

Refined and expanded by Doepfer, the A-101-2 Vactrol LPG adds some biology to your Modular patches.

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This plug-in REQUIRES Modular

Gongs, plucks, twangs, and more

Organic, buttery, warm, woody, rubbery, musical, natural, acoustic — these are words that commonly describe the character a low pass gate module can add to synth patches.

Expertly made presets

Buying this module gives you over thirty new and inspiring presets, instantly putting the Doepfer LPG to excellent use in your Modular rack.

A classic concept extended

Originally, the low pass gate was invented by legendary synth pioneer Don Buchla. Doepfer has expanded on the golden concept of the master by adding clever features, not least the Resonance control which can add anything from a subtle nuance to screaming resonance, and further into self-oscillation.

This expands the capabilities of the module, changing it from a mere controlling tool into an additive, creative one. Start by sculpting a simple waveform into a xylophone, then burn it up into a wailing, fire-breathing dragon... all with one module.


Vactrol control

The hardware Doepfer LPG modules are based on vactrols, just like opto compressors. The response time of these can vary wildly, which is part of the LPG charm. Softube's plug-in version of the Doepfer LPG adds the Vact switch which is not part of the original hardware. This lets the user select between a fast, medium or slow response time, to cover the variation between individual analog units.

Being able to offer something in software that doesn't exist in hardware is a thrill for us here at Softube, but we never do it if it means compromising on quality. Luckily, we were able to get our hands on, and model the characteristics of, multiple modules to bring this feature to life.

In short

  • Vactrol control of a 12 dB low pass filter and a voltage controlled amplifier.
  • Switch between three different sets of vactrols — slow, medium and fast.
  • Auxiliary control of output mode (Low Pass, LPG or VCA mode) via the G1 and G2 inputs.
  • Requires Modular.

Have a listen

  • System requirements

    • Mac OS X 10.12 or newer.
      • Windows 64-bit, versions 7, 8 or 10.
    • Intel Core 2 Duo, AMD Athlon 64 X2 or newer.
    • Screen resolution 1280x800 or larger.
    • 1 GB RAM or more, and at least 6 GB hard disk space for installation (individual plug-ins take less space).
    • Any VST, VST3, AU, or AAX (Pro Tools 10.3.7*, 11.0.2 or higher) compatible host application.
    • Softube account.
    • iLok account.
    • Internet access for downloading the plug-in(s) and managing the license(s).
    • iLok generation 2 and up, if you intend to use an iLok dongle for authorizing your plug-ins (note that an iLok dongle is not a requirement).
    • All Softube plug-ins support both 32- and 64-bit hosts, although a 64-bit OS is required. Supported sample rates: 44.1, 48, 88.2, 96, 176.4 and 192 kHz, in both mono and stereo.

      *Please Note: Pro Tools 10 is not officially qualified by Avid higher than OS X 10.8.

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