Lesson 1 — Sound Basics
Before you twist knobs, you need to know what sound actually is.
Understanding Waveforms
Waveforms are everywhere. They are the patterns behind the sound you hear, the colors you see, and the electricity powering your devices. Right now we are focusing on how waveforms shape the sounds we hear by manipulating the air around us through a speaker.
Think of a speaker cone as a piston. When it moves forward, it compresses air. When it moves back, it rarefies air. Your ear reads those pressure changes as sound. The shape of the movement decides the character of the sound. A smooth, flowing motion produces a smooth tone. A sudden, jerky motion produces a rough or edgy tone.
Sine and square waves are opposites. A sine wave is the smoothest possible vibration — the speaker cone glides in and out like a calm ocean swell. A square wave is choppy and on/off — the speaker cone snaps between its extremes as if it is tapping the air at the frequency of the note. That sharp switching fills the sound with extra harmonics, making it sound brighter, hollow, and more aggressive than the pure, rounded sine wave.
Press play on each card to hear how each waveform manipulates the air differently.
Sine Wave
The sine wave is the purest, simplest vibration. The speaker cone moves in a smooth, continuous arc, gently pushing and pulling the air. Because there are no sudden changes, a sine wave contains only the fundamental frequency and no harmonics. It sounds round, mellow, and flute-like — like a tuning fork or a single pure tone.
Square Wave
The square wave is the opposite of smooth. The speaker cone snaps instantly from full push to full pull and back again, like tapping the air at the frequency of the note. Those sharp edges create a series of odd harmonics, giving the square wave a hollow, woody, clarinet-like tone. It is the classic sound of retro video games and bold synth leads.
Sawtooth Wave
The sawtooth wave is rich and bright. Its shape ramps up smoothly then drops sharply, over and over. That sharp drop contains both odd and even harmonics, so it sounds buzzy, aggressive, and full. It is the go-to waveform for brassy leads, bright pads, and powerful basses that cut through a mix.
Triangle Wave
The triangle wave sits between sine and square. It rises and falls in straight lines, so it has the odd harmonics of a square wave, but those harmonics fade quickly. The result is a mellow, flute-like tone with just a hint of buzz — softer than a square wave but more present than a sine wave.
Frequency, Hearing & EQ
Everything you hear is made of frequencies. Understanding where sounds live on the frequency spectrum is what turns random knob-twisting into intentional mixing.
Human hearing generally spans from 20 Hz to 20,000 Hz (20 kHz). As we age, the top end shrinks, but the fundamentals of mixing stay the same.
Sub bass sits below 60 Hz — that is the trunk-rattling “BOOM.” We do not hear much below 20 Hz, but a good subwoofer lets you feel it. Earthquakes rumble around 5–10 Hz, and those low sub frequencies are why movie theaters give you that sense of impending doom.
Male voices usually fall between about 85 Hz and 180 Hz. Female voices typically sit from 165 Hz up to around 1,050 Hz. So if you want to bring a female vocal down in a mix, you know to focus your EQ roughly in that 165 Hz – 1.05 kHz window.
Vocal ranges: Bass ~60–250 Hz, Baritone ~110–245 Hz, Tenor ~130–440 Hz, Alto ~175–700 Hz, Soprano ~260–1,100 Hz. These ranges overlap, but they give you a starting point.
Bright, annoying sounds often live between 2 kHz and 5 kHz. If something hurts your ears, start high and sweep down until you find the problem, then cut a little.
“The better you understand frequency, the easier it is to apply EQ with intent and get the results you are going for.” — Monakai
Frequency Guidelines
Low / Sub — Below 60 Hz: rumble, sub-bass, kick thump.
Low-Mids — 60–250 Hz: warmth, body, bass guitar, male vocal fundamentals.
Mids — 250 Hz – 2 kHz: presence, vocal body, snare, guitars.
High-Mids — 2 kHz – 5 kHz: clarity, intelligibility, “brightness,” potential harshness.
Highs / Air — 5 kHz – 20 kHz: sparkle, cymbals, breath, detail.
Mixing & Mastering Frequency Tips
The annoying range usually falls between 2 kHz and 5 kHz. When you are mixing or mastering a track, you can usually cut or substantially lower the extremely high frequencies above 10 kHz — and definitely anything above 15 kHz. By lowering unnecessary or unwanted frequencies, you leave more room to boost the perceived volume of the track, focusing on the frequencies you actually want to be heard.
The same goes for sub frequencies. As beginners, we all make the mistake of cranking up the low end to make a track boom. But in doing so, we often turn up unheard low frequencies that cause the track to peak and distort the output — making the overall track sound less loud and doing the exact opposite of what we were trying to achieve. Try it for yourself on your next project.
“Remembering these tips and guidelines will take your mix to the next level instantly.” — Monakai
The tone generator feeds the graphic EQ. The visualizer shows what is happening across the frequency spectrum in real time. Boost a band to push that frequency range; cut to reduce it.
Notes, Keys & Tone
Every note you have ever heard is a sound produced at a specific frequency. Frequency is measured in Hertz (Hz), which simply counts how many times the air vibrates each second. When those vibrations happen faster, we hear a higher pitch. When they happen slower, we hear a lower pitch.
Think of a piano. Every key is connected to a hammer that strikes one or more strings. Those strings are tuned to vibrate at a set frequency. When the string moves back and forth, it moves the air around it, and that moving air reaches your ear as sound. If a string is tuned to 523.25 Hz, the note you hear is C5 — the famous “high C” an opera singer uses to shatter a wine glass. That happens because every object has a resonant frequency — the frequency it naturally vibrates at when energy is applied. If the glass's resonant frequency is 523.25 Hz, the singer's sustained C5 pours energy into that natural vibration until the glass cannot take it and cracks. The same idea applies to everything from speaker box design to room acoustics, but we will save that deeper dive for another discussion.
What is a note?
A note is a named pitch with a specific frequency. A4 is defined as 440 Hz. Middle C (C4) is about 261.63 Hz. Notes give us a common language for pitch: instead of saying “play 523.25 vibrations per second,” we say “play C5.”
On a piano, pressing a key triggers a mechanical action that causes a hammer to strike a string. That string vibrates at its tuned frequency, and the soundboard amplifies those vibrations into the room.
A tine works the same way: it is a small metal prong (like in a Rhodes piano or music box) that vibrates at a set frequency when struck or plucked. Whether it is a piano string, a tine, or a vocal cord, the idea is identical — a specific vibration rate equals a specific pitch.
What is a key?
The word key has two common meanings in music. First, it is the physical lever you press on a keyboard or piano. Second — and more importantly — a key is the tonal center or scale a piece of music is built around.
A song in the key of C major uses the notes C, D, E, F, G, A, and B as its home base. When a note fits that scale, it is in key. When it does not, it is out of key. Playing out-of-key notes is not always wrong — it can add tension, color, or emotion — but it is a deliberate choice.
What is tone?
Tone can mean a few related things. Most often, it describes the quality or color of a sound — what makes a trumpet sound different from a piano even when they play the same note. That tone comes from the waveform and the mix of harmonics riding on top of the fundamental frequency.
Tone can also mean a single musical sound or pitch, like a “dial tone” or a “warning tone.” In everyday speech, people sometimes use “tone” and “note” interchangeably, but in sound design and music production, tone usually refers to timbre, while note refers to pitch.
In tune vs out of tune
To be in tune means to be tuned to a specific frequency. A piano string is tightened until it vibrates at exactly the target frequency for its note. If you loosen the string, it vibrates slower and produces a lower frequency — a flatter, deeper tone. If you tighten it further, the frequency goes up and the pitch becomes sharper and brighter.
This is why guitarists turn tuning pegs, why orchestras tune to an A440 reference, and why a slightly out-of-tune synth can sound thick and chorused while a badly out-of-tune instrument sounds wrong.
“Notes are the map, frequencies are the territory, and tone is the color of the landscape.” — Monakai
🎧 Monakai Pro Tip
When I first started, I thought EQ was magic. It is not — it is just volume per frequency. Start by cutting what you do not want before boosting what you do.
Key Takeaways
- Sound is vibration. Pitch, loudness and timbre are the three main qualities we hear.
- Waveform shape determines timbre: sine is smooth, saw is bright, square is hollow, triangle is soft.
- EQ lets you shape a sound by boosting or cutting frequencies.
- Notes, scales and keys are the building blocks of melody and harmony.
Practice This
Open your DAW and apply one idea from this lesson to a 16-bar loop. Don't worry about making a full track — just experiment until the concept feels natural in your hands.
Try Monakai's free VST3 plugins to hear these ideas in action, and check the music production blog for more tips.