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 Anna by Outsim is a Virtual Instrument Audio Plugin. It functions as a VST Plugin.
Product Anna
Developer Outsim
Price (MSRP)
Type / Tags
Plug-in, App & Soundware Format(s)
Operating System Availability
Download Released
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Miscellaneous Information
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Max. 6 items
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Anna is a Hybrid Synthesizer. It came second in the KVR Developer Challenge 2006.


  • Four oscillators capable of complex waveforms, utilizing internal frequency modulation with separate waveforms and frequencies for the carrier and modulator.
  • Spread knob on oscillators, running three detuned oscillators internally in the oscillator, resulting in a total of up to 12 oscillators.
  • Two multi-mode filters with 14 different modes and internal filter overdrive.
  • Pitch tracking of the filters, allows the user to "play" the filters.
  • Four multi-mode LFO's with random, waveform and step sequencer modes.
  • Four modulation envelopes with basic and multi-point modes, user-defined slopes for each of the stages and looped sustain section.
  • Extensive modulation matrix with 16 slots. Modulation sources include oscillator and filter outputs (all modulations are "audio rate").
  • Frequency Modulation XY-pad defining the following oscillator frequency modulations: oscillator 1 > 2, 1 > 3, 2 > 3 and 3 > 4.
  • Effects section with fully parametric two-band equalizer, two modulated stereo delays with four-band filter control in the feedback loop and cross-feedback between the two delay units and a crusher unit capable of sample rate reduction, bit resolution distortion (not the standard kind, sounds more like a broken transistor radio) and distortion. The order of the effects is user-definable.
  • Auto-disabling of unused sections to reduce CPU usage.


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