SIR1 is a free convolution reverb.
You will need reverb IRs to use this plugin.
SIR has a really good, easy to use envelope control and is showing you visually how it affects the waveform/impulse.
There is an EQ, you might not see directly:
Just click in there and you get points you can draw your curves with.
Everything else is mostly self-explaining.
One negative aspect: It comes with a fixed latency of 8960 samples.
Realtime is not an option and you might experience some “input lag”.
Clear, everything you need.
Easy to use and good manipulation. but high latency….
0,7% CPU load (FX6300)
Personal opinion: 8/10
Quite nice, but the latency is an issue. There is SIR2 with no such thing, but this one is not free.
I used SIR for some time but changed for many applications to ReaVerb.
I really like the EQ and how to manipulate the IR.
The biggest advantage is the easy handling and it is harder to get a bad result than with most other convolution plugins (provided the IR file is good).
Go for it, if you are a beginner and/or don’t care about latency.