here can we have 'outnumbering' to modify the wole previous clause? Pl. help.
Paraphrasing:
Her letters to another person were written over a long period of time, outnumbering her letters to any other person.
To be constructed correctly, the words in the modifier must refer to the entire preceding clause. Do they?
No. The number of letters allows us to talk about "outnumbering" her letters to others. But the "outnumbering" concept has nothing to do with the length of time over which she wrote those letters. She could have written them all in one (frenzied!) week. The "outnumbering" modifier does not address
letters written over a long period of time. No good.
it can modify everything but not the OBJECT or any other noun
Almost... but not quite. The "comma -ing" modifier modifies the entire preceding clause, which can include a noun or an object. But it does not modify ONLY the object, or ONLY another noun. It has to include the verb / action.
Re: the rest of your question, can you please transcribe the text of the problem? It's really hard for me to follow what you're saying when I can't see the actual sentence that you're talking about.
I THINK (but can't tell for sure without being able to read the actual sentence) that this is the issue: part of the sentence is "it was revived by Segovia," where the pronoun "it" refers to "classical guitar." We can re-write the sentence: classical guitar was revived by Segovia.
In that sentence, "classical guitar" (or "it") is the subject, not Segovia.
A "comma -ing" modifier that follows Segovia, then, would have to modify the entire clause, and especially the core of that clause, which is the subject and verb.
It sounds like the modifier was something like "having been won over by the instrument's sound."
This sentence would then be saying that the classical guitar revived (by Segovia) was won over by its own sound. The revived classical guitar was somehow won over by itself?

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