> What ever happened to the touchplate controller

We are still working on it. The latest design based on charge transfer
principle is very reliable but not fast enough (max. about 20Hz only, and
that's too slow for fast play). We will try to make it faster but I don't
know if it will work. You (i.e. this group) will be the first who is
informed if new results emerge.

Best wishes
Dieter Doepfer