Wonderful session! And it sounds like we’ve got the all clear for the ol’ Mellotron* used by Floyd, Zeppelin, Moody Blues, etc!
*the Mellotron is an electric keyboard that plays loops of prerecorded strings, flutes, etc, (think In The Court Of The Crimson King).
If/when we're doing things correctly, the videos are helping to spur thought, reflection and questioning - less any emotional engagement (though I can see how they can skirt the border of informational/emotional in a few instances). So, like any tool, we just keep firmly in mind that it is the intent behind their (proper) use, and making important distinctions between what's informative and what it isn't, that matters greatly, and counts for so much.
So we keep doing what we are doing?
Computer‑generated music ultimately produces sound waves in the air, just like any other sound you hear. These are longitudinal pressure waves: regions of higher and lower air pressure moving outward from a speaker to your ears.
Inside the computer / synth
Before the sound reaches the speaker, it exists as electrical or digital waveforms:
Digital instruments (synths, DAWs, plug‑ins) generate and combine these basic waveforms, then shape them with filters and effects to create different timbres.
- Sine waves: Smooth, pure tones with only a fundamental frequency.
- Square waves: Buzzy tones made of the fundamental plus odd harmonics.
- Triangle waves: Softer than square, still using odd harmonics but weaker ones.
- Sawtooth waves: Very bright and harsh, rich in many harmonics.
From electrical to actual sound
So: inside the system you work with electronic/digital waveforms (sine, square, triangle, saw, etc.), and what you finally hear are sound pressure waves in air created from those waveforms.
- The computer or synth outputs an electrical signal that has the same waveform shape as the sound you want.
- The speaker converts that electrical waveform into vibrations of the speaker cone.
- Those vibrations push and pull the air, creating longitudinal sound waves that your ears detect as pitch, loudness, and tone color.
Do the waves exist in the world naturally
Pure waveforms like sine waves occur approximately in nature, such as in water ripples or simple string vibrations, but they're never perfectly ideal due to real-world imperfections.
Non-sinusoidal waveforms—square, triangle, and sawtooth—do not exist naturally in their ideal forms.
Why These Are Artificial
Natural sounds (voices, wind, instruments) are complex, irregular waveforms made of many overlapping partials, not these clean shapes.
- Square waves require instantaneous jumps, impossible without electronics; nature produces rounded transitions instead.
- Triangle and sawtooth waves demand precise linear slopes and sharp resets, which don't happen organically due to inertia and friction.
- They're mathematical constructs used in synthesis for their harmonic content (e.g., square has odd harmonics; sawtooth has all harmonics).