I'm following on, from sockpuppets, to talking to myself (my last two posts), to ... writing. And the thorny topic of 'voice.' There is a logic, I think - something about being heard.
I never offer writing advice - there are many far more qualified than I to do that. (And many unqualified who also put in their five-pennyworth, but let's not talk about that.) I'm in the learning game, and can only talk about what seems to work for me. So this is definitely not about 'finding one's writing voice'. Instead it is a tentative exploration of how I think of it.
Writing, for me, is not the same as talking to myself on paper. For a start, in my mutterings while stirring the soup I rarely use complete sentences; I might throw in a little blasphemy, call myself a prat for burning it again (yes, I burn soup; and occasionally indulge in a little gratuitous swearing).
If I'm writing, incomplete sentences are deliberate. Words with no main verb just for emphasis. A passing swear word is deliberate, used sparingly and with thought for the reader. I hear the rhythm of a sentence - playing with word order until there is a music to it. Even when I write dialogue, I try to keep myself quiet and let the character express him/herself.
And then I read it aloud. Clunky bits are obvious when you read them to the plants (plants are a great audience. They can't answer back, nor run away). Tedious bits are obvious - because you race through them, skip over useless words. It is in the reading aloud that I 'hear' my own writing voice - and begin to explore the conversation between what I think I'm trying to say and the words I'm using to say it.
So that, for me, is what I mean by a 'writer's voice' - the rhythm of the words and their relation to meaning. But, as I said, that's my understanding of the term. What's yours?