Only recently have I discovered this fascinating website, trawling through most of the past discussions. I have had a lifelong interest in all aspects of organs and the repertoire. Recently I had the fortune to try the Frobenius organ in Kingston Parish Church. I understood this to have tracker action and wished to experience a relatively modern instrument, as I have only played earlier organs with very heavy action, particularly when coupled.
Imagine my surprise to find that the light action on each manual when coupled did not increase so that the ability to articulate the starting tone must be lost on the manual to which coupled. Can this be described as a tracker or mechanical action when coupling is achieved by non-mechanical means?