Refined Audiometrics Laboratory has updated PLParEQ1 to v1.16 and released PLParEQ4, a 4-band version of PLParEQ1, minus the GUI (It uses the VST host's default interface).

PLParEQ1 changes since v1.0:

• Implemented Stereo, Middle, Side filtering options, independently for each filter.
• Filter #4 was incorrectly wired by the GUI to respond to Type of Filter #1. Fixed.
• Fixed interactions between memory allocation and multiple host threads for improved stability.
• Made default Q = 0.707 (critical damping), and default Frequency = 1 kHz.
• Made all starting parameters into reasonable values on initial load.
• Fixed a glaring error that caused a crash when shared input and output VST buffers were passed to a non-block processed filtering operation. Triangular dither to 24 bit output results from double precision internal computations.
• Made minimum block size = 512 samples at low SR, and 1024 samples at high SR. It was found that 256 samples was just too short, too often, to be a very decent filter. Quality 1 => 512 samples at low SR, Quality 5 => 8192 samples at low SR. You may have trouble running live with Quality 4 and 5. But these high quality settings are usable during track bouncing.
• Made the denorm dither significantly below the dither used for conversion from double to float. Noise floors are now down around -149 dB RMS Wide, and essentially a flat (white) spectrum at around -188 dB/root Hz.
• Add dither to all conversions from double back to VST float.
• Change Q slider to use logarithmic scaling. This gives better resolution for the lower Q values. Also increase Atten range to -40 dB.