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 SIR1 by SIR Audio Tools is a Virtual Effect Audio Plugin. It functions as a VST Plugin.
SIR1
Product SIR1
Developer SIR Audio Tools
Price (MSRP) Free
Type / Tags
Plug-in, App & Soundware Format(s)
Effect(s) 
Operating System Availability
Operating
System
Latest
Version
Download Released
 1.0.11  Downloads Released
Supported Sample Formats (loads or saves) include
WAV
Miscellaneous Information
Copy ProtectionNone

SIR1 is a reverb device that works with "impulse-responses". Impulse-responses are generated by recording short, broadband signals and their corresponding room-reflections, and by cutting out the initial signal. What is left contains the information needed to reproduce the same room with other signals.

Features:

  • Works with a fixed latency of 8960 samples (possibly compensated by VST-Host).
  • You can adjust predelay, attack-time, length and stereo width of the impulse response.
  • Stretch (up & downsampling of impulse response).
  • FFT EQ (to adjust the frequency spectrum of the impulse-response).
  • Auto Gain (automatic volume compensation).
  • Dynamic CPU Consumption (use only the CPU power that is needed to get the result).
User Rated

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Discussion: Active

Discussion

9 February 2017 at 11:00pmThohi

Now, this may well be just me not being very knowable, but - how is "fixed latency" a feature? To me, it seems like a bug.

26 April 2017 at 2:47amdewdrop_world

This appears to be no longer available. The link redirects to siraudiotools' products page, where you can buy SIR2. There is no entry for (free) SIR1.

@Thohi It's too slow to calculate convolution without latency. The only way to do it without latency is fully in the time domain, where each sample of output requires /n/ multiply-and-add operations (/n/ being the size of the convolution kernel). It's actually faster to FFT the input, multiply by the IR spectrum, and IFFT to get the output... but you have to collect an entire FFT frame's worth of audio before you can do that, hence the latency.

26 April 2017 at 6:33amBlackWinny

The link is now hidden... but remains available. It is this one:

http://www.siraudiotools.com//downloads/Sir_1011d.zip

Cheers.

26 April 2017 at 3:26pmThohi

How then do the other IR reverb plugins do it with little to no latency?

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SIR1

Average user rating of 9.00 from 4 reviews

SIR Audio Tools
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