Lord Zoltan <bows> we must have been typing the same thing at the same time 
If I was assigning a team to investigate this, I'd give each person one question and the spectrogram as the possible answer, each person goes off and comes up with a theory (however bizarre), using the spectrogram as the answer, then once all the answers are in (independantly) each person gets another question to work with.
Randomly assigning scanning honking and farting tests to these rare UP's seems a slight waste of resources.
If I was assigning a team to investigate this, I'd give each person one question and the spectrogram as the possible answer, each person goes off and comes up with a theory (however bizarre), using the spectrogram as the answer, then once all the answers are in (independantly) each person gets another question to work with.
Randomly assigning scanning honking and farting tests to these rare UP's seems a slight waste of resources.