Soundspear S1 v1.0.0 (Win/macOS)

The S1 uses a VCA detection circuit on a selected frequency band to detect the signal peaks and boost the stereo spread accordingly. The image will be made wider during high-energy transients to prevent phase knockbacks.

You can choose and blend between different imaging algorithms, from haas delay or classical mid-side equalization to the emulation of SRS transfer functions.

The input signal is first fed to a detection circuit that reacts to the average loudness of the song, where:
Threshold controls the minimum peak detection,
Speed controls the intertia of the moving average from the detection circuit,
Low Pass allows to filter the input detection signal with a biquad low pass filter.
This detection circuit is used to dynamically adjust the stereo image of the sound:
High pass and Low Pass allow to reduce the stereo adjustments to a single frequency band,
Peak gain is the stereo gain that will be applied when the detection circuit hits his maximum value,
Circuit allows to choose and blend between different imaging algorithms: binaural delay (Haas), head-related transfer functions (SRS) and mid-side boost (M/S).
A post processing step allows to adjust the final render:
Makeup applies a negative makeup gain to compensate the induced stereo variance by reducing its average value,
Comp reuses the input detection circuit to apply a touch of VCA compression to the signal sides.

Home Page - https://soundspear.com/product/s1