diff --git a/.config/zsh/functions/rg-dir b/.config/zsh/functions/rg-dir
new file mode 100755
index 0000000..b114068
--- /dev/null
+++ b/.config/zsh/functions/rg-dir
@@ -0,0 +1,17 @@
+#!/usr/bin/env zsh
+# apply replay gain tags to files in ${1}
+
+setopt LOCAL_OPTIONS ERR_RETURN NO_UNSET PIPE_FAIL
+setopt CSHNULLGLOB # remove non-matching globs but cancel if nothing matches
+
+local dir=${1}
+
+rsgain custom \
+    --album \
+    --tagmode=i \
+    --loudness=-18 \
+    --clip-mode=p \
+    --id3v2-version=keep \
+    --opus-mode=d \
+    --preserve-mtimes \
+    ${dir}/*.{flac,mp3,m4a,opus,ogg,oga,wma,wav,wv,aiff,ape}