OpenPreamp 1.0.3

OpenPreamp 1.0.3

This patch updates the preamp controls and adds inverse gain compensation.

• Off appears first in the model menu; N-Type remains the initial selection.
  Saved model identities are retained.
• ENGINE choices are Circuit and HQ. Circuit is the reduced engine; its known
  HQ fidelity differences remain documented. HQ is the factory engine.
• OS offers only 1x, 2x and 4x. Initial rates are 1x for Standard/Circuit and 2x
  for HQ; after a manual selection, mode changes preserve the chosen rate.
  Old sessions retain their legacy rate/automation mappings.
• GAIN COMPENSATION moves input/output inversely in dB, independently of L/R LINK.
  It preserves current gains when enabled and stops the pair at either gain limit.
  Compensation couples user knob edits; it is not measured auto-loudness matching.
• Mouse-wheel gain and frequency adjustment works on hovered or clicked knobs.
• MS MODE, L/R LINK and GAIN COMPENSATION form a centered header group.
• Updated screenshots and illustrated manual. Fresh 48 kHz/PCM24 measurements
  compare all four models × Standard/Circuit/HQ × explicit 1x/2x/4x, with two
  offline captures per configuration and 92 PNG/SVG chart pairs plus raw CSV.
  Gain compensation is off for fixed-setting measurements. No synthetic hardware
  plots or physical hardware measurements are included.

Read the measurement report,
control details and user manual.
Linear sweep harmonic/alias maps complement the quantitative steady-tone tests;
short fixtures do not establish long recovery, listening approval or hardware
sound equivalence. Circuit has not passed every HQ sound-equivalence gate.

The universal macOS 11+ VST3, AU, CLAP and LV2 plugins ship in a Developer ID
signed, Apple-notarized PKG inside the notarized DMG. Run the PKG to install into
/Library/Audio/Plug-Ins for all users. After installation, a dialog lists matching
older/current user copies; Move to Trash is the default and still requires a
response. Newer copies and other accounts are retained. Unattended installs keep
user copies and include a review command in the installed support folder.

AAX binaries, private references and optional SDKs are excluded. Mono/stereo only.
Meters show sample peaks, not true peaks. There is no limiter. Mode changes reset
histories without a transition crossfade. Models use estimated parameters and
simplified devices. Direct host automation of one gain changes only that gain;
GUI compensation edits can record both gain parameters.

Downloads and verification

Use OpenPreamp-1.0.3-macOS.dmg or the direct OpenPreamp-1.0.3-Installer.pkg. Both are signed, Apple-notarized and stapled. The DMG contains the same PKG, manual and licenses. The PKG installs the four public formats into the main /Library/Audio/Plug-Ins folders.

The measurement ZIP includes all 92 PNG/SVG chart pairs, ordinary CSV tables and 37 compressed full sweep-map CSV files. The manual PDF, validation JSON and SHA-256 checksums are separate assets. Source archives are generated from this tag.

Apple Silicon and Intel (Rosetta) each passed 32 controls, 555 processor/UI, 58 native ADAA and 336 reduced-kernel checks, plus the ADAA alias test and 960 callbacks with no C++ heap allocation/free activity. Fresh AU factory rendering passed on both. Installer inspection and 10 cleanup-fixture checks per architecture passed; no live installation or user-plugin cleanup was performed during release validation.