Utility scripts, updates to start scripts.

scripts/nl-prepare-raw-files.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+for filename in worship.wavex altar.wavex; do
+	name=${filename%.wavex}
+	ffmpeg -i "$filename" -filter_complex 'channelsplit=channel_layout=2.1[L][R][B]' \
+		-map '[L]' "${name}-m48.wav" \
+		-map '[R]' "${name}-drums.wav" \
+		-map '[B]' "${name}-bass.wav"
+done