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 SIR2 by SIR Audio Tools is a Virtual Effect Audio Plugin. It functions as a VST Plugin and an Audio Units Plugin.
Product SIR2
Developer SIR Audio Tools
Price (MSRP)
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Plug-in, App & Soundware Format(s)
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SIR2 is an easy-to-use audio-plugin that provides high-quality reverberation. It offers zero-latency processing with low CPU-consumption and non-destructive audio processing of impulse responses. SIR2 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)).
  • Routing capabilities (mono->mono, mono->stereo, stereo->stereo...).
  • High-quality internal sample rate converting (sinc-interpolation).
  • Linear phase FFT-EQ.
  • 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.
  • Separate dry/wet control (-60db .. +20dB).
  • HDIR-Direct On/Off switch.
  • Imports WAV, AIF, FLAC, BWS, OGG file formats.
  • Built in impulse-file browser (with folders).
  • Quick wave-file merging (useful for special impulse response libraries).
  • No dongle required/no challenge response copy protection.
  • Auto-gain (automatic volume compensation).
  • HDIR-Direct option.
  • Waveform Zoom.
  • Picture association.
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