Spectral Audio ProTone

Spectral Audio ProTone Image

The ProTone is a true analog synth from the mid-nineties for the modern MIDI studio. It is monophonic and features two analog oscillators, a beefy resonant filter, flexible LFO, MIDI and CV/Gate control, and a simple intuitive hands-on layout with every control parameter accessible from the front panel knobs and switches.

Each oscillator features saw and pulse waveforms with independent waveform selection, tuning and level. White Noise is also available from VCO1. The oscillators can be sync'd and Ring Modulation can also be dialed in. The filter section allows for either high or low pass filtering and 12 or 24 dB/oct slopes with the usual cutoff and resonance knobs. A fairly standard ADSR envelope can be applied to the voltage-controlled amp, but there's only a decay envelope (Accent) for the filter. The LFO is quite flexible, with six wave shapes plus random, noise or external input. The LFO can be set to modulate VCO1, VCO2, Pulse-Width on VCO1, filter cutoff and panning. A few remaining controls include a Panner, and Slide (portamento) effect.

The ProTone features MIDI I/O and traditional CV/Gate I/O for use with vintage gear. A little too much like vintage gear, however, the Pro Tone does not have on-board program memory. But with such a basic synth architecture and no hidden menus or parameters, the ProTone is a hands-on tweaker's synth - full of fat analog bass and synth sounds with a squelchy filter and competent LFO. Additional features include external VCO and LFO inputs, MIDI controlled volume and frequency cutoff, velocity sensitivity, and stereo outputs. The ProTone makes a cost effective, reliable and unique alternative to many other older vintage dual-VCO analog mono-synths.

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7 Visitor comments
Dave Colins
October 12, 2012 @ 9:40 am
I think people get the wrong idea about this synth. Not every analogue has to be a bass monster!
If you want bass, get something else. If you want weird bubbling midrange and hi-pass filter sounds that you won't get on anything else you've ever used, get one of these. The build quality its pretty atrocious but it sounds far more interesting than any number of vintage monosynths.
Zerstoerer
August 3, 2011 @ 2:02 pm
Great LFO, weak Oscilators, strange but great Filter, if you need an old sounding Syn, which is simple in structure, but versatile in tweaking, this is one for you...I often use just the Resonance for rythmic pattern, in combination with a syntrack and a neptune, you get a semi-modular system, and as far as i know the price is about 250 euro, which is a joke....you get nothing analog with stereo-outs in this pricerange...its not crap...its pure fun
esteban
December 3, 2010 @ 2:40 am
the filter are aaaamazing!!!!!! nice machine mono-phonic pure analog synth
alessandro_
November 1, 2010 @ 10:12 pm
LFO's section is one of the best i ever heard. i remember i always ended up with a sounds that was sounding exactly like a duck. was funky as hell!! i want it again! just for this!
Mik
March 12, 2009 @ 11:31 am
I agree it's not one of the most exciting analogue synths out there but I really liked the hipass filter on this one, and the LFO is superfast. It does sound different to any analogue synths I've owned. I eventually sold it because I can do crazy filter modulation with Sherman Filterbank aswell.
 
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VSE Rating

Excellent

User Rating

Rated 2.95 (100 Votes)

  • Check Price
  • The link above will take you to an eBay search for this synth to see active listings. If you don't find it there, try looking in our forum marketplace or post a wanted classified.
  • Specifications
  • Polyphony - Monophonic
  • Oscillators - 2 analog VCOs (Sawtooth and Pulse Waves); White Noise Generator; True Ring modulator
  • LFO - 1 (Rectangle, Impulse, Triangle, Sawtooth, Sinus, Noise and Random); Wide LFO Range: 0.005 ... 3800 Hz; LFO Targets: VC01, VC02, Pulse Width of VC01, Cutoff and Panorama
  • Filter - High and Lowpass Filter with Resonance, Selectable 12 or 24 dB per Octave, Accent (Decay Envelope for the Filter)
  • VCA - ADSR
  • Effects - Slide (portamento)
  • Memory - None
  • Keyboard - None
  • Arpeg/Seq - None
  • Control - MIDI In/Out, CV+Gate In/Out
  • Date Produced - 1996-2001
  • Resources & Credits
  • Images from Spectral Audio

    Reviewed August 2008.

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