• 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
  

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 ;-)