1980s Crumar Bit 01 Expander Rack Mounted Synthesiser

The Crumar Bit 01 Expander Rack Synthesiser delivers a warm, vintage analogue tone that is a super-rare find. Perfect for synth enthusiasts who crave hands-on control and rich, characterful sound. A true collector’s piece from the golden era of 80s synthesis, this rack unit is ideal for musicians, producers, and vintage gear lovers seeking a historically significant, MIDI-capable Italian polysynth.

• 6‑voice programmable polyphonic analog synthesizer in a 3U rack format; rack version of the Bit‑99 keyboard synth
• Oscillators: Two digitally controlled analog DCOs per voice (triangle, sawtooth, pulse; noise available on DCO 1) 
• Filters & Envelopes: 24 dB resonant low-pass VCF with dedicated VCF and VCA ADSR envelopes per voice 
• Modulation: Dual LFOs per voice. Waveforms include triangle, ramp (up-saw), and square
• Performances & Memory that stores up to 99 patches; 75 single patches, and 24 split/double performance presets 
• Split/Layer Capability that offers Upper/Lower zones with separate audio outputs—great for layering or splitting sounds 
  
• MIDI In (no MIDI Out) with support for all 16 channels, modulation, pitch bend, and patch changes
• Optional parameter editing via front‑panel interface and cassette tape backup (no MIDI patch dumps) 
• Released 1985–88, replacing the Bit‑One and preceding the Bit‑99 keyboard version; designed by Crumar, with Mario Maggi’s involvement in the design lineage