Back to the raw power and purity of non-programmable discrete analogﾖﾖwhere Studio Electronics started in 1985. The snap and punch of hardware envelopes drive the Boomstar SEM's brilliant voltage-controlled circuits with unparalleled sonic integrity and versatility. Boomstar is the ultimate desktop analog synthesizer for those who remember and desire still, the electronic analog sound of the Oberheim SEM that changed the world and for seekers who have yet to discover that magic and delight in their time.

This American-made music machine's discrete voltage-controlled analog oscillators, hand-matched transistors, in its filters and amplifiers, and Studio Electronics' typically expressive hardware programming features, fully realizes its name, from its earthy, grounded subs to its deep field sonic shimmers.

Specifications and Functions

Construction
Sturdy steel chassis, 31 pots, 2 rotary switches, 18 toggle switchesﾖﾖ15 three way for expanded functionality, through hole circuit boards, AC power adaptor.

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. 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 Type
SEM = Classic Oberheimﾮ 12db (full function, with LP to HP mix control)

Attack, decay, sustain, and release pots; Center off toggle switch to select envelope invert or LFO gate trigger; Single or multi- ple 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ﾖﾖ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.

Additional
Master tune pot; Bend range pot; Glide time pot: Dynamics to filter frequency pot; Envelope 1 to oscillator 1 pulse width pot.

Mixer
Oscillator 1 level pot; Oscillator 2 level pot; Ring Modulator level pot; Noise level pot; Feedback pot.

Front Panel Jacks
CV in, Gate in; Filter frequency modulation in; Amplifier modulation in; External signal in.

Back Panel Jacks
Midi In, Midi Out, 1/4" Audio out, DC power input.

Back Panel Switches
Learn switch: Select midi channel, note priority, aftertouch and mod wheel assignment; Tap tempo for LFO.

Overflow Switch
For polyphonic "Boom-Starring"