I've noticed exactly the same effect, but I don't think it has anything to do with the topology, as I'm able to repeat it with the simple cmoy I use as a portable amp.
Geeŋgo wasiŋ nona kamaaweti, namo ejembanoŋ ii moma laariwutiwaajoŋ ama yoŋonoŋ korebore motooŋgo kolooŋ laligowutiwaajoŋ qama koolijeŋ.