How to make quick notes? (6)

I believe the answer is:

presto

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'how to make quick notes?' is the definition.
I can't tell whether this defines the answer.

'how to' is the wordplay.
'how' becomes 'pres' (I am not sure about this - if you are sure you should believe this answer much more).
'pres'+'to'='PRESTO'

Can you help me to learn more?

(Other definitions for presto that I've seen before include "fast to the maximum" , "In quick tempo (mus.)" , "Hey ..., said the magician" , "29 [ADAGIO]? On the contrary" , "Hey . . . . ., says the magician (6)" .)

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