Simple: Respect the dynamics. In order to fully appreciate the different nuances of your music, they have to be different (duh). Although this sounds obvious, the current trend in music is to overcompress the masters, trading sound quality for sound quantity (volume). It is a question of taste and style. Personally, I prefer to let the music “breathe” (by not overcompressing it) and let the listener find out that the volume knob also works clockwise.
If, on the other hand, you want your album to sound so loud it could break the seams of the Universe, go somewhere else. There are plenty of other studios where they are good at just that, and in the most professional manner, but it's not here.
A Little History
Although I have been working almost exclusively for Estudio Uno (one of the best studios in Spain, probably in Europe), this all started in my living room, which we normally call "salón" in Spanish, hence the name: I try to make your music sound prettier, and I do it from my salón, with all the love and care your reliable beautician would put into making you look drop-dead gorgeous.
I am proud to say all kinds of clients have passed through my beauty salon; from small DIY musicians to signed artists. Everybody is treated with the same respect while I make sure that we achieve the sound they are looking for. Because, besides a mastering engineer, I'm still also a musician and I know how much effort and money it takes to do what you do. So I want you to be proud of your album and then, only then, is my mission achieved.
I use a pair of unbelievably nice vintage Bowers & Wilkins speakers and a vintage Linn pre-amp which combined make everything sound like you are not looking at a tree but the whole forest. I use a Mackie Big Knob to control the volume, a Presonus interface that works marvels and a computer full of state of the art plugins. Working “In The Box” (without hardware) makes things easier and faster, and allows me to charge you less than other studios.
I also have a very nice set of ears, a lot of patience and I will surely speak your language (including Klingon).