In today's tutorial we begin to delve into the world of digital audio. Let's start with a simple solution of the problem, problem that many people will ever encounter. How to change the pitch of a file (or of a part of file) lossless audio? The answer is “can not”. To change the pitch you need a small (laughable) loss of information, imperceptible, but it is better to know.
For this tutorial we will use the open source audio editor Audacity, and we will use this audio file.
First of all open Audacity and import the file: “File” – “Import” – “Audio”.
We select the file (or part of it) with the mouse. To select all of the audio track on information chicchiamo, in the left part, to select part of it, drag the mouse over the track.
At this point we go on “Effects” – “Change pitch”.
You do not need to know what the actual note that we are changing. It may not be a note, but of an entire song. The important thing is to know how much we want to raise or lower. Let's say that a song is played in the key “SOL”: will select from the first drop-down “G” (Sol in inglese), decide whether to translate it into acute or severe, and from the second drop down choose the tone in which we want to play us. The rest of the settings are not useless, but they are used to a more advanced level.
Now we can confirm and listen to the pitch change.
This technique reminds me of when I was younger and I was trying to play along with the songs of AC / DC to learn. I could not though because my guitar was given seemed forgotten. The truth is that the guitar was tuned to 440hz, while the AC / DC I think they play on 415hz, I was their lowest of my half semitone. To play along I had to forget I even half a semitone, but if I had the knowledge of today, I would have saved a lot’ tunings.