SPECIFICATIONS & FUNCTIONS
Construction
Sturdy steel chassis, 29-31 pots, 2 rotary switches, 18-19 toggle switches—15 three way for expanded functionality—AC power triple output desktop adaptor (15, -15 Volt Auto-Switching Supply). Tried and true through-hole technology—not surface mount—for integrity of sound quality, durability, and serviceability.
Dimensions
Height: 2.05" (52.07 mm) at front, 3.625" (92.075 mm) at back, Width: 8.7 " (220.98 mm), Depth: 7.05" (179.07 mm).
Sound Generation
All discrete circuity, with the exception of the software LFO. Hand matched transistors in filter and amplifier.
Oscillator 1
6 position rotary range switch; Two center off toggle switches select combinations of sine, triangle, saw and square waveforms; Pulse width for square waveform; Sub oscillator with center off toggle switch for half and full level positions; Sync oscillator 2 to oscillator 1 switch.
Oscillator 2
6 position rotary range switch; Three position toggle switch to select triangle, saw or square waveform; Fine tune pot; Mod depth pot with center off toggle switch to select modulation by envelope 1 or 2; Keyboard tracking on-off switch.
Filter / Envelope 1
Frequency and resonance pots; Center off toggle switch to select half and full keyboard tracking; Envelope mod depth pot; Additional mod depth pot with center off toggle to select modulation by oscillator 2 or the LFO. Envelope 1: Attack, decay, sustain, and release pots; Center off toggle switch to select envelope invert or envelope loop.
Filter Types
3003—resonant low-pass, diode ladder, 4-pole 24 dB/octave (Roland® TB-303); 4072—resonant low-pass, 4-pole 24 dB/octave—12 kHz design miscalculation corrected—(ARP® 2600); 5089—resonant low-pass, transistor cascade ladder, 4-pole 24 dB/octave (Moog® Model D); 8106—multi-mode non-resonant high-pass, resonant low-pass, 4-pole 24 dB/octave (Roland® Jupiter8); SEM—multi-mode resonant low‑pass/high‑pass, band‑pass and notch, 2-pole 12 dB/octave (Oberheim®); SE80—dual resonant hi-pass/low-pass, 2-pole 12 dB/octave (Yamaha® CS-80).
Envelope 2
Attack, decay, sustain, and release pots; Center off toggle switch to select envelope invert or LFO gate trigger; Single or multiple triggering switch; Center off toggle switch to select drone and envelope 1 as master. With master selected, envelope 2 is the modulator for both the amplifier and filter frequency. Envelope 1 remains active for oscillator 2 frequency and oscillator 1 pulse width modulation.
XMod
Oscillator 2 mod depth pot with center off toggle switch to select modulation of oscillator 1 pulse width or oscillator 1 frequency.
LFO
Rate pot; MIDI sync on-off switch; Waveform pot: sine, triangle, saw up, saw down, square, offset square 1 and 2, random and slew random waveforms; Mod depth pot with center off toggle switch to select oscillator 1 frequency or oscillator 1 pulse width; Mod depth pot with center off toggle switch to select oscillator 2 frequency or oscillator 2 pulse width.
Amplifier
Center off toggle switch to select two levels of overdrive; Volume pot.
Tuning
Master tune pot.
Bender
Bend range pot.
Glide
Hardware exponential glide time pot.
Dynamics
(routes MIDI keyboard) Dynamics to filter frequency pot.
Envelope 1 to Pulse Width 1 (ENV1> PW1)
(routes) Envelope 1 to Oscillator 1 pulse width pot.
Mixer - OSC
Oscillator 1 level pot; Oscillator 2 level pot.
Mixer - Ring Mod
Hardware Ring Modulator level pot.
Mixer - Noise
Noise level pot.
Mixer - Feedback
(routes the synth's output back through the filter) Feedback level pot.
Front Panel Jacks
CV in, Gate in, Filter frequency modulation in, Amplifier modulation in, Oscillator out, External signal in.
Back Panel Jacks
MIDI In, MIDI Out, 1/4" Audio out, Traveller input (SE80 model only), DC power input.
Back Panel Switches
Learn switch: Selects MIDI channel.
Overflow Switch
For chaining together multiple Boomstars together via MIDI overflow.
