091Audio have released HPDoctor, available as a FREE download.
HPDoctor is a precision low-frequency processing — 1 to 150 Hz.
Most high-pass filters stop at 20 Hz and offer a limited set of slopes and filter types. HPDoctor goes down to 1 Hz, covers fractional slopes from 1 dB/oct up to 24 dB/oct, and includes seven filter types for different sonic and phase characteristics. A focused utility for situations where a regular HPF isn’t precise enough.
Use cases:
- Removing DC offset without touching the audible low end
- Cleaning up subsonic energy before compressors
- Shaping kicks and bass with resonance around the cutoff
- Console-style high-pass emulation
- Mastering cleanup where precision matters
- Phase manipulation and alignment via the allpass mode
Features include:
- Frequency range: 1–150 Hz Slopes from 1 dB/oct up to 24 dB/oct (type-dependent)
- Seven filter types: Butterworth, Elliptic, Chebyshev I, Chebyshev II, Bessel, Ladder, Allpass
- Optional “Const -3 dB” mode for consistent cutoff behavior across filter types
- Full 64-bit double-precision internal processing
- Click-free transitions for all parameter and filter changes
HPDoctor is available to PC and Mac users (VST3 and AU).
For more information and to download HPDoctor, click here:
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