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Specs, features & overview captured below.
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"Studio Electronics Boomstar 4075 Specs & Features
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: 4075-classic ARP 2600
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
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
Oscillator out
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 BOOMSTAR-ing with multiple BOOMSTARs (sold separately)
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
8.7" W × 7.05" D
2.05" H at front, 3.625" H at back
Overview
Studio Electronics Boomstar 4075 Overview
Back to the raw power and purity of non-programmable discrete analog, where Studio Electronics started in 1985. The snap and punch of hardware envelopes drive the Boomstar's brilliant voltage controlled circuits with unparalleled sonic integrity and versatility. Boomstar is the ultimate desktop analog synthesizer for those who remember and still desire the electronic analog sound that changed the world, and for seekers who have yet to discover that magic and delight in their time.
There are four Boomstar models, each with a different filter; the Boomstar 4075 you're looking at now has the classic ARP 2600 filter.
This all-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, with its earthy, grounded subs to its deep field sonic shimmers: BOOMSTAR!"
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