Behringer ABACUS Analog Music Computer for Eurorack

Buchla's legendary 257 and 281 analog synthesizers are considered classics of their genre, implemented in a wide range of musical applications. The Behringer ABACUS is modeled after these original instruments, featuring an array of linear, logarithmic and exponential triggered or continuous functions.

Modulate and Push the Tempo
The ABACUS can generate musical envelopes or LFO signals up to 25 minutes in length and as fast as 1 kHz. Designed for use with other modules, it also allows you to change the modulation depth, modulate backwards and create even more musical events by manipulating tempo.

Unlimited Creativity
By manipulating the ABACUS' control knobs, incoming signals can be an amplified, attenuated, integrated or inverted for unlimited creativity. Totally unique and crazy warped effects like lag, slew or portamento can be applied to control voltages perfect for use with a sequencer, or synth keyboard. Up to 4 control voltages can be combined to generate even more complex modulations.

Eurorack Ready
ABACUS is designed to fit into a standard Eurorack case. Just connect the power cables to the power supply and mount the module using the included screws. This allows for ABACUS to be mixed with other synth modules for a truly unique set up.

An Amazing Value
Linear, logarithmic and exponential, the ABACUS from Behringer is an amazing synth module that opens up so many possibilities!

Features

• Algebraic sound processor modeled after Buchla's models 257 and 281 from the '60s
• Perform wide range of linear, logarithmic and exponential triggered or continuous functions
• Generate musical envelopes or LFO signals up to 25 minutes and as fast as 1 kHz
• Change the depth of modulation or even modulate backwards
• Create musical events such as ramping up or down in tempo
• Amplify, attenuate, integrate or invert incoming signals for unlimited creativity
• Apply lag, slew or portamento to control voltages for unique warped effects
• Initiate musical events upon sensing motion in the system
• Create note division and flam for amazing effects
• Generate complex modulations by combining up to 4 CVs
• LEDs indicate activity on all outputs for visual monitoring
• Eurorack specs: 20 HP, 60 mA +12 V, 50 mA -12 V

Specifications

Inputs
- CV 1-4, Trig 1-4, Rise 1 & 4, Fall 1 & 4
- Both 1 & 4, Cycle 1 & 4: 3.5 mm jack

Outputs
- CV 1-4, OR, SUM, INV, 1 & 4, 1 EOR, 4 EOC
- 3.5 mm jack

Controls
- 1 & 4 Rise, 1 & 4 Fall, 1 & 4 Response knobs
- 1 - 4 attenuverter knobs
- 1 & 4 Cycle buttons

Impendances
- Rise & Both CVs: 100 kΩ
- Fall CVs: 33 kΩ
- CV Inputs 1 & 4: 33 kΩ
- CV Inputs 2 & 3: 75 kΩ
- Trigger Inputs: 100 kΩ
- Cycle Trigger Inputs: 50 kΩ
- Outputs 1-4, INV, SUM, OR: 680 Ω
- EOR/EOC: 2.2 kΩ
- f 1 & 4: 100 Ω

Sensitivities
- Trigger 1 & 4: 4 V minimum
- Cycle 1 & 4: 1.8 V minimum

Power Consumption
- 60 mA +12 V / 50 mA -12 V

Dimensions
- 20 hp
- 10 cm x 12.8 cm x 2.4 cm (3.94" x 5.04" x 0.94")

Weight
- 191 g (6.74 oz)