diff --git a/.gitignore b/.gitignore
index 83f4d96..67a380f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,3 +50,10 @@ umbraaudio_package.zip
 
 # SQLite project databases are runtime state, never source
 *.db
+
+# Voice-matrix lab samples: large binaries, regenerable from the scripts beside
+# them (backup/author_voice_lab/scripts/). The findings, the measurement JSON
+# and the code stay tracked.
+/backup/author_voice_lab/wav/
+/backup/author_voice_lab/wav_cliff/
+/backup/author_voice_matrix/**/*.wav