Studio Electronics ToneStar MFR# ToneStar 2600
Studio Electronics ToneStar
Complete SE synth voice with Arp filter
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$499.00
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Description

The Studio Electronics TONESTAR is an ARP® 2600-inspired synth voice 31 years in the shaping, pre-patched like Pearlman's prodigy, and fully "outs to outs" in-the-box modular, allowing for highpass/bandpass/notch filter tones, and bristling X-mod effects. Connect CV / gate and twist 'n' switch, or pull its tones and voltages apart one 3.5mm cord at a time. 26 knobs, 7 switches, and 21 jacks make for complex and satisfying signal flow, color and collisions. If it gets reedy, route the triangle wave 'round the VCF, and push dat Sub. Nearly thrilling Out to Outs/Interesting Patches .pdf (in case you missed it above).

Caswell Knowledge (circuit designer):

"The VCO is the same affair as the Oscillation, the Boomstar, and the Omega. It's kind of a combination of Arp®, Oberheim® and Moog® circuits (sort of a greatest hits), time-tested, very stable—very good tracking over a very large range; certain parts have to be hand selected to achieve that level of exacting performance. Editors Note: This module is a TONESTAR—its own thing—and not a 2600 clone attempt; nevertheless, the Tone☆ tugs lovingly at times on the sleeve of the 1970's era classic.

Envelope FYI: The Tonestar Sustain control replicates the behavior of the 2600 and Odyssey: after the initial Decay, it continues to move (sink) very slowly, adding a little extra texture to the sound. It's technically a flaw, but after digging out my Odyssey, it is for sure a desirable "quirk", and the perfect companion to the 4072 filter (which is mistakenly titled a 4075 in the Boomstar Modular line).

Another bit of fun: The LFO is voltage controlled, so you can envelope, LFO, or otherwise modulate both the rate and the depth; the ADSR amount is also voltage controlled, so it can be manipulated by MIDI dynamics, MIDI volume, an LFO, etc. Greg [St. Regis] has decreed that anything must be patchable to anything, so some technically wrong patchings (for example, pulse wave out to ADSR out) may often produce unexpectedly interesting, x-mod/notch filtering—quite pleasing effects.

The Tonestar was Greg's concept, but as I understood it, the goal was a single oscillator, 2600 VCF, pre-patched and yet fully modular classic synth voice, at a specific size, wielding every trick that Studio Electronics could cram in. Main use would be as a go-to bassline/lead tool, or a premium quality, entry-level, complete synth module, for root-to-leaf sound design, and multiform analog exploration/expression."

( ) represents normalled connections, which will be explained in greater detail before long.

26 Knobbed and "Shafted" Potentiometers

  • VCO: FREQUENCY, PULSE WIDTH, LFO (^), GLIDE, MOD (ADSR), SAW, SQUARE, SUB, TUNE; Noise: LEVEL;
  • VCF: FREQUENCY, RESONANCE, TRACK, DRIVE, ADSR, MOD (LFO);
  • LFO: DEPTH (OSC), SPEED; ENVs: (ADSR) ATTACK, DECAY, SUSTAIN, RELEASE, (AR) ATTACK, RELEASE;
  • VCA: FEEDBACK (filter), VOLUME

7 Switches

  • VCO: OCT (up/down), FREQ/PW, NO VCF;
  • VCF: FREQ/RESO;
  • LFO: TRIANGLE/SQUARE*;
  • ENVs: DRONE, MASTER;
  • VCA: IN/MIX

21 Jacks

  • VCO: TRIANGLE, SAWTOOTH, SQUARE, MIX, 1V/O, MOD IN;
  • NOISE: NOISE (white);
  • LFO: DEPTH, TRIANGLE*, SQUARE, SPEED;
  • VCF: EXT IN, FIL OUT, MOD IN;
  • ENVs: MOD IN, ADSR OUT, AR OUT, GATE IN;
  • VCA: IN/MIX, VCA IN, OUTPUT

All Controls—arranged in order of signal flow—and Patch Points

VCO:

  • FREQUENCY – Oscillator frequency attenuator.
  • PULSE WIDTH – Variable pulse wave width control.
  • OCT – +1/-1 octave switch.
  • LFO (^) – Triangle wave low frequency oscillation to pulse width control.
  • FREQ/PW – Oscillator frequency, or Pulse (square wave) width to ADSR modulation routing switch. Center off.
  • GLIDE – Slew generator control.
  • TRIANGLE/NO VCF – Triangle to VCA switch—bypasses VCF.
  • MOD (ADSR) – Oscillation modulation via ADSR control.
  • SAWTOOTH* – Sawtooth wave attenuator.
  • SQUARE* – Square wave attenuator.
  • SUB – Square wave Sub Oscillator attenuator.
  • TRIANGLE* – Waveform output.
  • SAWTOOTH* – Waveform output.
  • SQUARE* – Waveform output.
  • MIX – Composite waveform output.
  • 1V/O – One volt per octave control voltage input.
  • TUNE – Master fine tune (approx. -5/+ 5 semitones).
  • MOD IN – Modulation CV input. Normaled to ADSR; ADSR is replaced when alt. source connected.

Noise:

  • NOISE – White noise generator output.
  • LEVEL – Noise attenuator.

VCF:

  • FREQUENCY Frequency, or cut-off attenuator
  • RESONANCE – Resonance, or Q attenuator.
  • TRACK – Keyboard/voltage tracking attenuator.
  • DRIVE – Oscillator output to filter input attenuator.
  • FREQ/RESO – Filter Frequency, or Resonance to LFO modulation routing switch. Center off position.
  • ADSR – Filter to ADSR envelope attenuator.
  • MOD (LFO) – Filter to LFO attenuator.
  • EXT IN – External audio input.
  • FIL OUT – Filter audio output.
  • MOD IN – Frequency or Resonance modulation CV input.

LFO:

  • TRIANGLE/SQUARE* – Waveform select switch (triangle core).
  • DPTH (OSC) – LFO to Oscillator control.
  • SPEED – Speed or rate attenuator.
  • DEPTH – Control voltage Input.
  • TRIANGLE* – Triangle wave output.
  • SQUARE*– Square wave output.
  • SPEED – Speed or rate CV input.

ENVs:

  • ATTACK – Attack stage control.
  • DECAY – Decay stage control.
  • SUSTAIN – Sustain stage control.
  • RELEASE – Release stage control.
  • DRONE/MASTER – Indefinite/instant sustain, and master mode for ADSR routing switch. Center off.
  • ATTACK – Attack stage control
  • RELEASE – Release stage control.
  • MOD IN – Allows for dynamic modulation of the ADSR, eg., if you want the amount of modulation added to/determined by a external source, jack in; or if you prefer, modulation input to the ADSR routing—use with velocity, or a sequencer: the sequencer could isolate the ADSR amount the amount to a single step in the phrase for example. Exciting. A second external envelope can provide an interesting effect, or the AR (in the box patching).
  • ADSR OUT – ADSR output.
  • AR OUT – AR Output.

VCA:

  • FEEDBACK – Oscillator/filter feedback loop control.
  • VOLUME – Master volume control.
  • VCA/CV – Amplifier control voltage output.
  • IN/MIX – VCA mix input switch switch (normalled jack). When set to IN, external audio replaces filter output to VCA; when set to mix MIX, filter output is fed along with the filter audio to VCA.
  • VCA IN – Audio input.
  • OUTPUT – Main output.

Vitals:

  • PCB Mounting Scheme - Through-hole.
  • Filter - Discrete, voltage controlled, 24/db/oct cascaded transconductance low-pass filter, employing six pairs of hand-matched transistors.
  • Size - 32hp.
  • Depth - 35mm including connectors.

Optional DIY Adjustments

Units #2-15 / Noise - The noise on the Tonestar leans to the Pink side, a little dark and moody. Some may like it, some may want the more bright and sizzled white variety. One resistor or capacitor change will shift it to the white spectrum.

Units #2-22 / Feedback - The Feedback loop is big, bold and deep on the low end; maybe a bit too much so. One resistor change will reign it in, but still allow enough chaotic madness at maximum level.

Technical Specifications

Additional Information

Condition New
Chassis Eurorack Modular
Input Connectors 3.5mm
Output Connectors 3.5mm
Connector Type 3.5 mm
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