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"The spectral ProTone of audio is a very versatile monophonic analog synthesizer with very an independent sound. It provides powerful analog sounds with incisive character and can In addition to great use as an excellent filter bank and MIDI Interface for old analog synthesizers. The device provides two independent analog oscillators, ring modulator, faster LFO (up in the audio range) with different waveforms (random / noise / ext.) and many modulation options (VCO1/VCO2). The filter can between high and low pass and be switched over 12db and 24 db. Similar to the Roland TB303 the protons is also one function Accent available. The device can be controlled directly via MIDI. In addition, a jew CV/Gate Port on the back there."

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