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Behringer 2-XM

Item: SYN0009249-000

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Analogue Synthesizer, Oberheim Two Voice, SEM, Clone, 4x VCO, 2x SVVCF, 4x ADS-EG, 2x LFO, Voice Mixer, Patchpanel, Polychain All product info

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Behringer 2-XM

Semi-modular synthesizer

Analog Synthesizer
Clone of the Oberheim Two Voice (1975)
Desktop case (19" & Eurorack compatible)
dual SEM architecture
2 voices (unison, Split or Dual playable)
2x 2 oscillators with sawtooth & square with PWM waveforms
PWM or pitch modulation per voice
2x hardsync
2x state variable filters
2x signal mixer
2x noise generator
2x VCA with drone mode
2x LFO
2x 2 ADS envelopes
Voice mixer
Portamento per voice
2x 16 CV/Gate/Audio inputs & outputs
MIDI & USB In
Mono / Stereo Main-Out
Polychain with several 2-XM units

The Behringer 2-XM at a glance

The Behringer 2-XM is a faithful clone of the iconic Oberheim Two Voice from 1975. Technically, it combines the original 1974 SEM synthesizer with the later SEM patch panel, resulting in a streamlined but fully capable version of the classic. What defines all SEM synthesizers, regardless of era or number of voices, is the structure of the individual voices. The SEM is renowned for its extremely warm and smooth sound. Even at full resonance, it never becomes harsh or aggressive. This makes it ideal for pulsating basses, radiant leads, organic sync sounds and precise sequences. Behringer has preserved the character of the original while adding subtle enhancements. For example, the triple selector switch for oscillator modulation now includes E+V (envelope with velocity), and the same feature has been applied to the two VCAs. In the oscillator mixer, the EXT control now provides a noise generator instead of a second input for external signals. The 2-XM features dual voices, each fully equipped. A voice mixer is included, and portamento can be set independently per voice. By changing the form factor, Behringer was able to accommodate the 2-XM in the proven desktop housing, which means that it can be mounted in a 19" rack with optional rack ears and can even be installed as an 80HP module in the Eurorack modular system.

One SEM Voice

Each voice mirrors the historical SEM design with three minor updates. The analog signal path begins with two oscillators generating sawtooth or square waveforms with PWM, adjustable across five octaves. Oscillator two can be synced to oscillator one, and both pitch and pulse width can be modulated via envelope or LFO. The oscillator mixer determines which waveform is sent to the filter and at what level. The EXT control can feed an external audio source or a noise generator to the filter. The filter is a true state variable design, first introduced in 1974. In LP-HP mode, the control continuously morphs the filter from lowpass through notch to highpass. In BP mode, the control has no effect, but a rich bandpass filter processes the signal. The VCA completes the audio path. Two ADS (Attack/Decay/Sustain) envelopes and an LFO with a sine waveform modulate the voice. Except for the VCA, all modulation sources are pre-wired to the filter and oscillators, with ENV2 controlling the VCA.

The patch panel

On the right-hand side of the control panel there are 2x 16 CV, gate and audio inputs and outputs for each voice. If you patch e.g. Gate 1 to LFO Trig, the LFO is restarted with every note played. You can also cross-patch the outputs of the VCOs to the CV input of the other VCO to create cross-FM sounds. If you include the neighboring voice, the two voices can modulate each other! Anyone who is familiar with the ancestor list of SEM synthesizers will have been amazed by the powerful 8-Voice. Thanks to the polychain mode, you can combine several 2-XM units with each other and create your own budget 8-voice with four devices ;-)