Change vs. modify

[Elly]

Synonym Search, Intermediate level

ESL/EFL Test #106 "Synonyms for change and shift", question 5

If you ......... your voice, she will not recognize you on the phone.

(a) change
(b) modify
(c) transform
(d) transmit

Synonym Search, Intermediate level

ESL/EFL Test #106 "Synonyms for change and shift", answer 5

If you change your voice, she will not recognize you on the phone.

Correct answer: (a) change

Your answer was: incorrect
If you modify your voice, she will not recognize you on the phone.
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cant we use modify here?

Elly

[Tamara]

In my view, you'd modified your voice if you made an operation to change it significantly (and can’t return to its initial sounding.)

Am I right?

Or if you use special devices / software like these sound packs www.screamingbee.com/product/products.aspx
(it’s not advertising of them just an example of such things)
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