While not having had the time yet to shop for parts for the basic solenoid test, we urge electronics buffs and experimenters to consider the didgeridoo trajectory for a switching harness. Whereas Roland and EWI MIDI controllers use logic gates to decode sax switching logic, a mechanical approach to switching logic for the didj harness is possible. Besides low-note priority, there are two places on the horn where this logic becomes mandatory, because one key can "stand for" another key, its neighboring key also becomes involved. We think that any of the two mechanisms on the harness that accomplish this more complex decoding than simply the low-note priority decoding would be interesting to the viewer if it were encased in clear plastic, the mechanism being reminiscent of watchworks.