Studio Electronics Boomstar 4075 Analogue Synth Module

Main Features

• All analogue two oscillator desktop synth
• Fitted with a classic ARP 2600 style filter
• CV and Gate inputs along with MIDI I/O
• MIDI overflow mode for daisy chaining with other Boomstars
• All discrete circuitry with hand matched transistors for the filter and amp

The Studio Electronics Boomstar 4075 is a two oscillator analogue monosynth module with a powerful and resonant ARP2600 style filter.

Back to the raw power and purity of non-programmable discrete analogue, where STUDIO ELECTRONICS started in 1985. The snap and punch of hardware envelopes drive the BOOMSTAR 4075's brilliant voltage controlled circuits with unparalleled sonic integrity and versatility. BOOMSTAR 4075 is the ultimate desktop analogue synthesizer for those who remember and desire the electronic analogue sound that changed the world, and for those seekers who have yet to discover that magic and delight.

Driven by rapid fire hardware envelope snap, and near Modular sound flexibility, the STUDIO ELECTRONICS BOOMSTAR® 4075 desktop synth is a performer and sound designer's waking dream. The Boomstar foundation: two Oscillators—stackable waveforms with Sub OSC, two Envelopes—invertible, loopable, with 'drone' and 'master' mode, is accented expressively by hardware XMod and exponential glide, extensive modulation routing, and a flexible software LFO: jacked for heavy lifting and fine-tuned experimentation—even go 'off synth' with the external input.

The quick-turn shaft pots along the bottom for the hardware Ring Mod, Noise, Filter Feedback and VCO Levels make vital sonic change intimate, immediate, and indispensable: the adjacent Overdrive switch adds warmth and edge. Thirty one pots insure fluid, intuitive mastery over wide-ranging sweep and subtlety of tone: feather in the changes or whip them suddenly and rhythmically into shape.

The 4075 features an all-analogue ARP2600 style filter. This classic filter offers you the powerful and resonant tone from this classic and revered synth from the 70's.

S. E.'s patchable, discrete, through-hole, hand-matched transistor, American-made analogue synthesizers are as rugged as they are flexible: inspiring instruments built to last a lifetime, and then some, no matter which brilliant, hand-crafted filter model you choose.


Boomstar 4075 Specifications & Functions

Construction
Sturdy steel chassis, 31 pots, 2 rotary switches, 18 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 inch (52.07 mm) at front, 3.625 inch (92.075 mm) at back, Width: 8.7 inch (220.98 mm), Depth: 7.05 inch (179.07 mm).

Sound Generation
All discrete circuitry, with the exception of the software LFO. Hand matched transistors in filter and amplifier.

Oscillator 1
6 position rotary range switch: Two centre off toggle switches select combinations of sine, triangle, saw and square waveforms: Pulse width for square waveform: Sub oscillator with centre 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 centre off toggle switch to select modulation by envelope 1 or 2: Keyboard tracking on-off switch.

Filter / Envelope 1
Frequency and resonance pots: centre off toggle switch to select half and full keyboard tracking: Envelope mod depth pot: Additional mod depth pot with centre off toggle to select modulation by oscillator 2 or the LFO. Envelope 1: Attack, decay, sustain, and release pots: centre off toggle switch to select envelope invert or envelope loop.

Filter Type
4075—ARP2600. Need we say more?

Envelope 2
Attack, decay, sustain, and release pots: centre off toggle switch to select envelope invert or LFO gate trigger: Single or multiple triggering switch: centre 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 centre 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 centre off toggle switch to select oscillator 1 frequency or oscillator 1 pulse width: Mod depth pot with centre off toggle switch to select oscillator 2 frequency or oscillator 2 pulse width.

Amplifier
Centre 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 inch Audio out, DC power input.

Back Panel Switches
Learn switch: Selects MIDI channel.

Overflow Switch
For chaining together multiple Boomstars together via MIDI overflow.