Notes are for frequency and there are marks for intensity, but you still have to write down what instrument is used.

In general in the vocabulary of smells you try first to understand the instrument (certain fruit, manure, sea, etc) and then the intensity of it.

I'm not very familiar how the intensity and variations are described but I presume that it is not as formal as in the case of music.

But it has no help if you can't smell it (the frequency is out of the hearing limit) or you can't recognize the instrument from the noise.