It sounds good- - sound is the main, finite verb and agrees with the singular subject. It makes it/me/them/ you sound good -- make is the main, finite verb and agrees with the singular subject it; it/me/them are objects; sound is an infinitive, the object complement. It may make it/me/them/you sound good -- as above, but now the finite verb is the auxiliary verb may , which does not change with person: I/you/he may .
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