What is the difference between veturas and vojagas.

Now that sentence takes me back. I did that when I was 18.

Could you say "buse" instead of "per buso" here?

I wrote 'by a bus' because if I omitted a/an it was always wrong. But this time it isn't needed?

Poderia ser BUSE?

Somehow the spoken sentence makes the "v" sound in "veturis" like a "d" sound, which threw me off. Per my understanding of Esperanto, all letters are homophones, meaning they can only be spoken in one sound. Please correct me if I am wrong. Also, it would be nice if we can have the option of slowing down the spoken sentence down like the other languages.