That is so awesome! The digital tuner is extremely useful. I think the only thing I wish I could do with it is bung in the tuning hex code instead of seeking or loading from disk. But that is a minor niggle and it works really well :)

Also, that may be your sole contribution, but I suspect that work is the majority of the diff from Acorn's ATS. That and switching the I/O to I2C via the user port.