Initial revision

src/routing-drag-line.h

@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "alsa.h"
+
+void add_drop_controller_motion(
+  struct alsa_card *card,
+  GtkWidget        *routing_overlay
+);