version 6.4.53, January 9, 2026

• Scripting: fixed some problems introduced in version 6.4.52 concerning the interaction between pause windows and editor scripts.
• Scripting: runSubprocess and runSystem now support asynchronous, with which you can spawn a subprocess without waiting for it to finish.

version 6.4.52, January 3, 2026

• MacOS Tahoe: support making menu choices or turning windows to full screen if a script is paused (by the Demo window or the Pause window), as on earlier MacOS versions and on Windows and Linux.
• Windows: support horizontal scrolling in three ways (two-finger swiping on the touchpad; left and right tilting of the mouse’s scroll wheel; turning the mouse’s scroll wheel while keeping the Shift key pressed).
• Linux: prevented a crash when a “barren” edition tried to run runAllTests_batch.praat.
• Sound: To PowerCepstrogram... now averages the power over channels instead of taking only channel 1.

version 6.4.51, December 30, 2025

• Windows: switch back to the faster version (version 6.4.50 was deliberately slower, so as to support Windows 7 and 8.1 for the last time).

version 6.4.50, December 29, 2025

• A bit of speech recognition via Whisper.cpp (adapted to Praat by Anastasia Shchupak), such as Transcribe interval in the TextGrid window. This works after you install one or more Whisper-cpp models, such as ggml-base.bin (from https://huggingface.co/ggerganov/whisper.cpp) in the models subfolder of the preferences folder.

version 6.4.49, December 23, 2025

• Open without error messages or warnings Kay files that have one sample too few or too many.
• Linux: the standard Linux edition now runs equally well on Ubuntu, Fedora, Debian and Centos.
• EditDistanceTable: made readable and writable.

version 6.4.48, December 9, 2025

• Linux audio: recognize JACK devices (next to the already recongized ALSA devices).
• Linux fonts: support for the Charis 7 font, as on macOS and Windows.
• OTGrammar: non-negative maximum entropy learning.
• Debug option at start-up from command line, e.g. --debug=58.

version 6.4.47, November 7, 2025

• Sound: To LPC...: channel averaging by default.
• runSystem and runSubprocess should not divert a terminal window’s standard output.
• Repaired a bug from November 2014 by which writing a BarkSpectrogram to a binary file used an incorrect format.

version 6.4.46, October 20, 2025

• ScriptEditor: made Run selection work again on Windows and Linux (bug since 6.4.44).
• Made pause windows (and perhaps Demo window) compatible with macOS 26 (Tahoe).

version 6.4.45, October 13, 2025

• Made Picture window 60×60 inches (instead of 12×12).
• Windows: repaired a crashing bug in runSystem introduced in 6.4.44.
• Made progress bar writing compatible with macOS 26 (Tahoe).
• Repaired an old bug that could crash Praat when viewing a Table with 0 rows.

version 6.4.44, September 25, 2025

• Made runSubprocess compatible with the Microsoft runtime (instead of MinGW).
• Made Info window writing compatible with macOS 26 (Tahoe).
• Made demoShow compatible with macOS 26.
• Made ScriptEditor menus reachable on macOS 26 when the script is paused.