Examine Structure Keys and Values

I've been scratching my head over this for some time... how am I supposed to view the contents of a structure? Which means their keys and 开发者_开发百科their corresponding values. I've been playing with the Audio Input patch a ton, and want to know how best to examine the data it's sending out.

Currently I've resorting to patching the Spectrum to a Structure Index Member patch, then sending the member to an Image With String, and the resulting image to a Billboard, just to see the value. Then I change the index number to see different values. But this leaves me 100% in the dark regarding just what the indexes/keys are supposed to be in the first place.

How do I determine the keys provided in a structure output by an arbitrary patch?

The Audio Input patch doesn't use structure keys — the standard way to access its elements is to use the Structure Index Member patch.

For patches that do use keyed structures (Directory Scanner's inner structures, for example), hovering over the structure output will reveal the key names (in double-quotes).

I swear I was hovering over the output 'spectrum' point for long enough...

But alas not, this popped up after giving it another try:

However, this still does not provide me key names. Does it?