I’m in looking at some album files. 8 songs.
The original was released on cassette in the 80s. I believe it was recon 4 track portstudio. It’s since been made into mp3 and pirated, and uploaded to YouTube.
I have been sent wav files that are considered by the band to be “the best possible masters”. This is preparation for a vinyl release. (I know… don’t ask)
The issue is that these masters, while being considerably better quality than any previous versions, are slower, audibly, and of course lower in pitch.
These masters came from a DAT master that was made 25 odd years ago, moved to computer maybe 10 years ago, and copied/etc who knows what, since then.
I’m guessing there has been a bit rate conversion done badly, from 48 to 44.1 or something.
If we assume this? What conversion should I do to reverse this?
If this is not correct, and I don’t get back the correct timing/pitch by a simple conversion, what’s the best way to stretch/compress these files to match the correct speed.
What is the sample rate now?
I’m guessing there has been a bit rate conversion done badly, from 48 to 44.1 or something.
I’ve heard of that can happening with a digital S/PDIF connection, presumably because the computer is just receiving the audio data without knowing the sample rate. (With USB the hardware can communicate with the software & drivers.)
The Change Speed effect changes speed & pitch together like an analog speed change or a sample rate change/error. 48/44.1 = 1.088 so you can enter that as the Speed Multiplier.
Then it would be a good idea for you (or a musician) to confirm it’s not off-key, If it’s still off it may take some trial-and error.