Write method

[dy]

When we want to record data not to the end, but to the middle. That is too slow to invoke set, so maybe rename push to write with possible offset?
Also we need delete, or update(from, to). Basically Audio class can be changed at any point, so we need to be able to track it.
Mb make set more like splice, set(offset?, delete?, data)?

[dy]

Added set(data, offset=0). You can set any data at any offset, output it with the proper range.