SIR Reverb VST SIR is a free VST reverb effect device that works with “impulse-responses”. Impulse-responses are generated by recording short broadband signals and their corresponding room-reflections. What you get contains the information needed to reproduce the same room with other signals freeware Windows VST-Plugin 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 & down sampling 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) Info & Download >> siraudiotools / SIR