: For controlling how high and low frequencies decay over time.
: It includes specific "smooth" and "vintage" algorithms that allow it to emulate older hardware units from the 1980s and 90s.
At that time, the audio world was obsessed with . Developers were sampling expensive hardware units (like the Lexicon 480L or TC Electronic 6000) using Impulse Responses (IRs). This was the era of "if it isn't a sample of hardware, it isn't good enough."
Unlike Waves or Native Instruments, which are massive corporations, ArtsAcoustic was famously small. Gerhard Schonberger was the sole architect. There are legendary forum threads from the 2010s where top-tier mixing engineers (people mixing for U2 or Coldplay) would post asking, "Please, Gerhard, just fix the bug on OS X 10.9!"
For film composers, the "Infinite" decay setting (toggle the Decay button to "∞") is a treasure. Version 1.6.0.15 prevents the infinite mode from building up resonant frequencies. You can freeze a string chord into a pad-like drone without needing a separate synth.
Adjust the decay, pre-delay, and room size with precision.
While convolution reverbs sounded realistic, they were static. You couldn't change the room size, the decay, or the damping in a musical way without loading a whole new sample.