SPECIFICATIONS & FUNCTIONS

Name: Boomstar 4075
SKU: 132549

Construction

Sturdy steel chassis, 31 pots, 2 rotary switches, 18 toggle switches––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 Types

5089—classic Moog® 24dB ladder, 4075—classic ARP® 2600; SEM—classic Oberheim® 12dB SEM (full function with LP to HP mix control); 3003—classic Roland® TB-303; 700—classic MiniKorg®; SE80—classic 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.