Author: Jooyoung Kim

Mixing Engineer, Music Producer

Basics of Mixing – 2.1 Wave

Hello, This is Jooyoung Kim, a mixing engineer and music producer.

To effectively mix, it’s essential to understand the nature of sound. Today, I’d like to talk about waves.

What is a wave?

There are various ways to define it, but a wave is fundamentally a method of transferring energy. When energy is transferred, some ‘things’ that carries this energy vibrates, and those ‘things’ is called the “medium.”

The medium for water waves is water!

There are two types of wave:
– Transverse Wave
– Longitudinal Wave

If the direction of the medium’s vibration and the direction of the energy’s travel are the same, it’s a longitudinal wave. If they are different, it’s a transverse wave.

Sound is a longitudinal wave with air as its medium. However, representing a longitudinal wave as a waveform can be complex, so in a DAW, it’s often converted into a transverse wave for simplicity.

A waveform commonly seen in DAWs

From now on, when explaining waves, I’ll use the transverse wave model. Although sound is a longitudinal wave, think of it as being converted into a transverse wave for easier understanding.

Each Circles(Reds, Greens) have same ‘Phase’

The first concept you need to understand is ‘phase.’

When I first learned physics, this was a confusing concept. According to my high school physics teacher, phase represents the ‘position and state‘ of a wave.

Simply put, if the movement direction and position of the medium at a specific point are the same, the phases are said to be identical.

Phases are expressed in degrees, which relates to representing waves as simple harmonic motion.

If the image is confusing, think of it as: “Waves can be represented by rotational motion, and thus can be expressed in degrees.”

All waves can be expressed as a combination of simple harmonic motions. However, delving into this topic would be too lengthy, so I’ll skip it for now.

You might wonder why understanding phase is important. It’s because it helps define other terms related to waves.

The shortest distance between points with the same phase is called the ‘wavelength.’ The shortest time to reach the same phase again is called the ‘period.’ The number of times the phase changes per second at a given point is called the ‘frequency.’

λ(lambda) is wavelength
T(time) is period

For instance, if a sound has a frequency of 1000 Hz, it means the sound vibrates 1000 times per second, and it takes 0.001 seconds for one vibration.

In waves, if you divide the speed by the frequency, you can find the wavelength. The speed of sound at room temperature is roughly 340 m/s, so with a simple calculation, you can find the wavelength for a specific frequency. Conversely, if you know the wavelength, you can find the frequency.

Mixing engineers might wonder why they need to calculate wavelengths when they only need to know the frequency. This is related to studio resonance.

When the wavelength’s length matches the room dimensions in specific ways, resonance occurs. This is known as Room Modes.

There are lots of articles about Room Modes

If you notice resonance at a specific frequency while listening or mixing, you can calculate the wavelength and compare it to your room dimensions. This helps determine if the issue is with the recording or the room itself.

There are websites that calculate these for you, but understanding the principle allows you to make calculations even in irregular-shaped rooms or environments where you can’t use such tools.

Find your room’s room modes

Today, we covered the concepts of phase, wavelength, period, frequency, and room modes.

I’ll stop here for now. See you in the next post!

Basics of Mixing – 1. What is mixing?

Hello, This is Jooyoung Kim, a mixing engineer and music producer.

In the field of audio engineering, where a certain degree of autonomous judgment is essential, I believe it’s important to continuously ask yourself questions.

So, let me start with a question for you.

What do you think mixing is?

Take some time to ask yourself this question and ponder over it. What is your definition of mixing?…

The answers might vary: balancing sounds, making them commercially appealing, combining multiple tracks into one format, and so on.

Personally, putting aside balance and everything else, I believe mixing is “the process of sonically realizing the composer’s intent.”

For instance, if the lyrics need to be clearly heard, that’s how they should be mixed. If a cello line needs to have a rich sound with a long reverb, then that’s what needs to be done. Furthermore, it’s crucial to understand the composer’s intent and sometimes provide sonic ideas that they might not have considered.

To achieve this, you need to use plugins or hardware that suit the characteristics of each track, and naturally, the settings must be tailored accordingly. This is why learning about audio technology and knowledge is important.

Since sound is a wave, the initial content will be closer to physics. If you’re not from a science background like me, it might feel tedious, and you might question why you need to learn this.

When that happens, remind yourself that “this knowledge is necessary to effectively realize the intent of my song or my client’s song sonically.” This will help you stay focused and on track.

Through my experience with mixing, I got my own definition. I hope you, too, will take the time to think about what mixing is and why you are doing it as you study and practice mixing.

In the next post, I will explain the scientific background knowledge that is essential for mixing.

See you in the next post!

Before starting the ‘Basics of Mixing’

This article was written on February 19, 2024. I will speed up as much as possible to match the speed of the blog I am currently running in Korea.

Hi, this is mixing engineer, music producer Jooyoung Kim.

I’ve spent a lot of time studying and delving into audio engineering on my own, but I’ve realized I haven’t written much about it on my blog.

Last December, I completed a manuscript on mixing and sent it to several publishers. While waiting for a response, I planned to write blog posts based on the manuscript once the book was published. However, the responses are taking longer than expected, and if it doesn’t work out, I don’t want to keep delaying. So, I’ve decided to start writing now.

The content might be a bit challenging. The primary goal of my writing is to address the lack of advanced mixing topics in Korea. While there are plenty of books covering the basics, there’s a shortage of resources for more in-depth knowledge.

If I simply transfer the manuscript directly to the blog, some parts might be difficult to read. Therefore, I’ll be adapting the content to fit the blog format, making it more accessible.

Some might wonder why I’m writing about mixing. I admit that my career isn’t particularly long or illustrious, and my academic background(major in Physics) isn’t in this field, which makes me feel somewhat apprehensive. Nevertheless, I’m convinced that many people are eager to learn more about advanced mixing techniques. Despite feeling a bit of pressure, I’m determined to share my knowledge.

Given the extensive nature of the topic, it will take quite some time to cover everything. I aim to write a post on this subject roughly once a week. However, I won’t focus solely on mixing; I’ll continue to write about a variety of topics, just as I have been.

Looking forward to diving into the main content with you in the next post. See you then!

I purchased a bow for an acoustic guitar (+ brief thoughts)

Hello, this is Jooyoung Kim, a mixing engineer and music producer.

Some time ago, I briefly saw a bow for an acoustic guitar. I wanted to buy it, but it was too expensive to justify purchasing it as a novelty.

Time passed, and when I was ordering a toroidal transformer for device repair from AliExpress, I wondered if they might also sell guitar bows. To my surprise, they were selling them very cheaply. I decided to purchase from a seller with a decent number of reviews and buyers.

The packaging was quite neat, which was surprising. Including shipping, I think I paid around 15$, and they even included rosin. The package contents seemed quite substantial.

Below is a video I recorded with my phone camera, so the quality isn’t great.

Due to the structure of the guitar and the bow, you can play double stops.

I also tried bowing sideways to see if I could play all six strings simultaneously, but the bow was too short, and I couldn’t apply enough pressure to produce a sound. A better guitar might produce a smoother and richer sound, but I didn’t want to use too much rosin and risk it absorbing moisture and becoming sticky.

When playing, I noticed that if the bow touched the guitar’s harmonic points, the sound would break. It was quite challenging to play, and I realized I might have underestimated it.

Originally, I planned to use this bow to dub MIDI recordings of violin parts, since recording strings can be expensive. However, it might be too difficult. The bow is too short for fast pieces, and the speed required would make it even more challenging.

On the other hand, it seems quite effective for fiddle techniques often used in country music, such as tremolo effects and repeated staccato chords. I think I’ll try writing some pieces incorporating these elements.

I have some songs I’ve been working on, but I haven’t released anything recently. This year, I plan to release at least three songs.

See you again in the next article!