If you are willing, I would be pleased to have reviews posted on Amazon and elsewhere and happy to receive feedback.
Here's a short introduction
What is metadata?
Any information that is included within a program, whether it is for a download or creating a disc, that is not the program itself. It is embedded within the digital file (as a download or when burned to disc). Examples are track IDs, start and stop IDs, ISRCs, UPCs, and CD Text information. One of the things that the mastering engineer is responsible for is understanding what these are and including all this information in a master.
What is an ISRC?
It stands for International Standard Recording Code. It is a number that is allocated to any publisher (record label, artist, or anybody that is owns a catalogue of music). It is registered in the USA with the RIAA (Recording Industry Association of America) and in Europe with GEMA (a performance rights organisation) . The code is a unique identifier that gets attached to every single piece of music (each song within a record would have its own ISRC code). Any time that the music is played over the air, downloaded or streamed, the identifier is logged. This is vital in the payment process .
What is a UPC?
It stands for Universal Product Code. Is a number assigned to a product. Traditionally it has been a physical item, such as a cereal box in a grocery store, which has a bar code (and correlating number) to scan at the checkout to identify what that product is. The same is true of CDs or DVDs. But they are also used to track downloads in some cases, so you should register and include it in your product.
What is QC?
This is what is known as Quality Check. Mastering is the final process before distribution. As a result, it is the mastering engineer’s job to make sure that there are absolutely no flaws in the program (a dropout or a click for example). The mastering engineer should give the client assurance that there is no problem with the audio.
Stereo-imaging tools are often included in DIY mastering packages or equalisers with stereo spreading facilities (most commonly offering some kind of mid-side processing options), so it is important to acknowledge their purpose and their limits.
As with many of the specialist tools we have for processing audio, they are great at solving specific problems. If you have something mono or largely in mono, for example, and you need to try and widen it, you can add reverb or perhaps exaggerate the little stereo information that already exists in the track.
But what exactly is the ‘stereo information’?
Well, it has to do with the relationship between the ‘out-of-phase’ information, and the ‘in-phase’ information. Anything that is in-phase happens at exactly the same time in both channels, and that information will appear to be centered. If anything is slightly delayed off to one side or the other, compared to the center of the image, it is ‘out-of-phase’ and is one of the things that creates a stereo sense of spread.
So when you are mixing, you are using pan pots, delays and reverbs (etc) to create a stereo image of individual elements within an overall stereo mix. However, when you go in during mastering and increase the out-of-phase component, you are changing the relationship between the out-of-phase and in-phase parts of the signal of the entire mix. You therefore are able to radically change the sense of the stereo image and the placement of each individual instrument in a song, which can be very dangerous if not treated with care. And although you may increase the perceived wideness, this is at the expense of the in-phase components in the song. That is to say, the elements that are dead-center, which also tend to be the most important elements of most productions – vocals, snare, kick, bass – are weakened.
So sometimes – in its various forms – stereo-imaging can be used to good effect. However, one should err on the side of caution.
Limiters (peak limiters, protection circuits)
Most common is a digital plugin. Plugins tend to be much faster, cleaner, and have less overshoot than what you get in the analog-domain.
Compressors
When you look at an equipment roster of a high-end mastering studio, a compressor will more likely than not be seen in any of the studio’s analog gear. It seems that DSP (digital signal processing) plugins do an excellent job of recreating the dynamic-range control that happens in an analog compressor, yet they don’t quite seem to sound just as good.
What could be the reasons for this? Let’s speculate a little.
When audio comes out into the analog-domain, you get added distortion and noise. These are not necessarily characteristics that will be programmed into the digital circuits (or, algorithms). As a result, you get a subtly different overall presentation of the sound.
The detection circuit (the device used to tell the compressor when to compress the audio passing through it) is what really drives the action of a compressor. Another possibility, which was proposed to me by George Massenberg, is that sample rate for the detector circuit in a digital compressor needs to be much higher than the typical sample rates we are using now, because of the nuances that you typically get at the output of a compression stage. 44.1kHz may be sufficient for the audio passing through the compressor, but it may not present enough detail for the audio that is feeding the detection circuit for the compressor to do as good a job as its analog counterpart. It is speculation, but it is an interesting point to consider.
A lot of the time you will find mastering engineers using an analog circuit not because they’re going to use an EQ to equalize, or a compressor to compress, but because there is something about the filtering that takes place when running audio through that analog gear that changes the sound in a desirable way. So, a great compressor may be used not to compress, but simply due to the tone-shaping sound that is imparted to the program. This seems to be a common factor missing from many current DSP equivalents.
Part 1: The Mastering Mindset
What is mastering?
· It is the last creative step, and the first step in distribution.
· It’s the last chance to catch any mistakes. When it leaves mastering, there cannot be any flaws in the master.
· It needs to function well in all common formats: mp3s, CDs etc.
· Getting it ready for distribution in these formats is key.
What are the responsibilities of the mastering engineer?
· In the case of a whole album, to take all the disparate pieces and unify them sonically (level and tone-wise).
· Pacing between the tracks should reflect the mood of the songs and allow each one to breathe or run-on to each other, depending on the desired effect.
· Enhance the sound – create a more open sound, a deeper sound, a fuller sound or a warmer sound etc – in a way that benefits the sound of the record.
· Sometimes you can enhance the dynamic range by turning up some sections and turning down other sections, reduce the dynamic range to create a louder master.
· Thus, the mastering engineer has some creative input. However, there is only so much that he can do in mastering, so that the mastering engineer relies on the mixing engineer to do a good job and to get the mix as close as possible to the desired sound.
What mastering isn’t...
· Mastering is not about making everything bright and loud!
· In this overcrowded and noisy world, the temptation to create a louder and brighter mix in hope of drawing attention is strong. However, such recordings tend to be hard to listen to for a sustained period of time, so that people may be reluctant (consciously or subconsciously) to come back and listen to them again and again.
Knowing what the artist wants…
· It’s important to know what the artist wants, so that you don’t land up going in a different direction.
· Have a discussion with the artist. You are more likely to keep him happy and achieve his vision. Sometimes, indeed, you learn from doing something you may not have considered before.
· At the end of the day, it’s art. And there are no recipes for what it ‘has’ to sound like. Always try to support the song’s meaning and artist’s vision.
Different styles of music...
· There will always be similarities – there is such a thing as ‘too much bass’ or ‘too much treble’ regardless of the style.
· However, different styles of music will require a different approach. For example, you want the low-end to lead in reggae, you want a wide stereo-image with depth (hearing into the reverb tails) and aggression through guitars with metal, a wide and true dynamic range with a classical recording...
· So, it is important to be informed about different styles of music and what each style wants.
What are the prerequisites for mastering at a high level?
A great monitoring system.
· Relatively neutral – no part of the spectrum is exaggerated)
· It’s phase accurate – the sound arriving from each speaker is arriving at the listener at the same time)
· Low distortion – so that nothing is being introduced by the monitoring system that is not in the recording. It also allows for longer listening periods without much fatigue.
A room that can support the monitoring system
· A quiet environment – so that you can ensure what you are hearing is directly from the speakers, and not ambient sound pollution.
· Size – the room needs to be large enough to allow the low-frequency information to be heard properly, for the waves to propagate.
What if I’m mastering at home?
· Get a good pair of headphones, with good low-frequency response.
· Listen to a lot of recordings you know and like, and become accustomed to the way that those sound in your listening environment(s).
· Have multiple monitoring environments so that you can get different points of reference (computer speakers, headphones, studio monitors, car speakers etc).
· Different speaker-systems will exaggerate different parts of the sound differently – so at least you’re not hearing a single distorting of the sound.