Boomstar SEM (Oberheim SEM filter)
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
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.
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).
All discrete circuity. Hand matched transistors in filter and amplifier.
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.
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.
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.
Oscillator 2 mod depth pot with center off toggle switch to select modulation of oscillator 1 pulse width or oscillator 1 frequency.
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.
Center off toggle switch to select two levels of overdrive; Volume pot.
Master tune pot; Bend range pot; Glide time pot: Dynamics to filter frequency pot; Envelope 1 to oscillator 1 pulse width pot.
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.
For polyphonic "Boom-Starring"
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