Here are a set of video demos of the Starkey Hearing Science modular synthesizer:

Starkey Hearing Science modular synthesizer Pt 1

Here’s what poster scienceforce has to say about the system:

Starkey Hearing Science analog modular synthesizer laboratory. It is a scientific instrument, with many particular synthesis features… with this gear you can also process any external signal inputs between filters, vco’s and more… The Starkey laboratory is absolutely not common & classic instrument

Starkey Hearing Science modular synthesizer Pt 2

Starkey Hearing Science modular synthesizer Pt 3