Hello.
Please take a look at figure at:
http://www.research.att.com/sw/tools/graphviz/examples/directed/datastruct.…
That looks something which Patchbay could look like.
Note the rounded cables.
Of course, please don't take that look literally. Look also at
http://chat.carleton.ca/~drobilla/patchbay.png
Regards,
Juhana