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Christian Knufinke Software has announced the release of SIR2, an easy-to-use audio-plugin that provides high-quality reverberation - the commercial successor to the freeware SIR1.

SIR2 offers zero-latency processing with low CPU-consumption and non-destructive audio processing of impulse responses. It includes high definition impulse responses (HDIR) of *real* places produced by Pinguin, Hamburg. You can also import impulse responses from free or commercial sources.


  • Zero latency processing.
  • Includes Pinguin's High Definition Impulse Responses.
  • "True Stereo" processing (a stereo convolution takes place for every source channel (left + right)).
  • High-quality internal sample rate converting.
  • Separate dry/wet control (-60db .. +20dB).
  • Auto-gain.
  • Free non-destructive amplitude envelope.
  • Free non-destructive filter envelope.
  • Predelay (0ms - 2000ms).
  • Stretch control (high quality resampling).
  • Forward / reverse switch.
  • Stereo In / Stereo IR Control.
  • Preset-managing.
  • Linear phase FFT-EQ.
  • Signal routing options.
  • HDIR-Direct On/Off switch.
  • Imports WAV, AIF, FLAC, BWS, OGG file formats.

SIR2 costs €149and is available as a VST effect plug-in for Windows. A demo version is available. Also available, priced at €129, is the Pinguin HDIR Extra Package, featuring 12 additional high-quality impulse responses for SIR2. To use HDIR Extra Package an installed and licensed SIR2 instance is required. They can be purchased together for €239.

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