DOEPFER A-101-2 Vactrol Gate Filter Eurorack Circuit

( Brand: Doepfer ), ( Model: A-101-2 VACTROL LOW PASS GATE ), ( Color: Silver ), ( Type: Modular Synthesizer ), ( Manufacturer Part Number: A-101-2 )

Review DOEPFER Vactrol Low Pass Gate Filter Eurorack New Perfect Circuit

The Doepfer A-101-2 Vactrol Gate Filter is a versatile and intriguing Eurorack module that brings together the unique characteristics of vactrols and envelope followers to create complex filtering and gating effects. This module is an updated version of the original A-101, with improved functionality and enhanced sonic capabilities.

At its core, the A-101-2 is a 2-pole, resonant low-pass filter. It utilizes vactrols, which are voltage-controlled variable resistors, to control the filter's cutoff frequency. This design enables the module to respond to control voltages in a smooth and organic way, providing a warm and distinctive sound that sets it apart from more common transistor-based filters.

The A-101-2 comes equipped with an envelope follower, which can be used to control the cutoff frequency based on the input signal's envelope. This feature makes the module an excellent choice for generating self-oscillating filter effects, as well as tracking and shaping the envelopes of external signals.

One of the most notable improvements in the A-101-2 is the addition of a gate input. This feature allows the module to function as a classic voltage-controlled gate, with the cutoff frequency being controlled by an external gate signal instead of the envelope follower. This makes the A-101-2 a versatile module that can be used in a wide range of applications, from simple filtering to complex modular sequencing and gating.

- Filter input: for the audio signal that will be filtered

- Envelope input: for connecting an external envelope source to be tracked

- Gate input: for controlling the filter cutoff frequency with an external gate signal

- Output: for the filtered audio signal

- CV input: for external control of the filter cutoff frequency

- CV output: for routing the filtered signal's envelope as a control voltage

The module's dimensions are 14HP wide and 35mm deep, making it a standard size for Eurorack systems. With its rich sound, flexible functionality, and unique design, the Doepfer A-101-2 Vactrol Gate Filter is an essential addition to any Eurorack modular synthesizer setup.

The Doepfer A-101-2 Vactrol Gate Filter is a Eurorack module that provides voltage control over the open and close times of a low-pass filter. This module can add depth and complexity to your modular synthesis setup, making your sounds more expressive and dynamic. Here are some pros and cons of buying a Doepfer A-101-2 Vactrol Gate Filter:

1. Expressive Filtering: The module allows for expressive filtering by controlling the filter's open and close times with voltage, resulting in a wide range of timbre variations.

2. Versatile: The Vactrol Gate Filter can be used as a gate, a voltage-controlled filter, or a voltage-controlled amplifier, making it a versatile addition to any modular synthesis setup.

3. Authentic Vactrol Character: The use of Vactrols, which are voltage-controlled resistors, adds an authentic analog character to the filter's sound.

4. Compact Size: With a width of only 24 HP, the Doepfer A-101-2 Vactrol Gate Filter is a compact and space-saving module, making it ideal for smaller modular rigs.

1. Complexity: The module can be complex to use, especially for beginners, as it requires a good understanding of voltage control and filtering to get the most out of it.

2. Vactrol Latency: The use of Vactrols can result in some latency, which may not be desirable in certain applications, such as fast envelope generators or trigger sequencers.

3. Maintenance: Vactrols require some maintenance, such as keeping them at a consistent temperature, to ensure they function optimally.

In conclusion, the Doepfer A-101-2 Vactrol Gate Filter is a powerful and versatile module that can add depth and complexity to your modular synthesis setup. However, it does require a good understanding of voltage control and filtering, and it may not be suitable for beginners due to its complexity and potential for latency. If you're looking to add expressive filtering to your modular rig and don't mind the complexity, then the Doepfer A-101-2 Vactrol Gate Filter is a great addition. If you're a beginner or prefer a simpler and more straightforward filter module, then you may want to consider other options. Overall, the Doepfer A-101-2 Vactrol Gate Filter is a worthwhile investment for advanced modular synthesists looking to add expressive and authentic analog filtering to their setup.

part # a1012 prices

• $127.00-$150.00

specifications synthesasha:

• brand: Doepfer
• model#: A-101-2 VACTROL LOW PASS GATE
• color: Silver
• type: Modular Synthesizer
• manufacturer part number: A-101-2

shipping synthesasha:

• type: Fixed
• transit: 2-6 Days
• cost: $0.00
• class: Standard
• service: Standard

offer synthesasha:

• options: Ship-to-home
• availability: In Stock
• quantity: 5
• sold: 0
• started: November 20, 2025

payments synthesasha:

• other
• credit card: Mastercard
• wallet: Google-pay

seller synthesasha:

• rating: 99.4%
• # reviews: 49626

general synthesasha:

• condition: New
• Musical Instruments Gear > Pro Audio Equipment > Synthesizers

returns synthesasha:

• method: Money back
• time: 30 Days
• policy: Returns Accepted
• paid by: Buyer

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