Crafting Sound with MASE: Inside the Engine, A Beginner’s Guide

Whether you are a seasoned synth enthusiast or someone who just loves to twist virtual knobs and see what happens, diving into a new synthesizer can feel a bit like stepping into the cockpit of an alien spacecraft.

That’s why I built the Modular Audio Synthesis Engine (MASE) - a fully interactive, browser based playground designed to let you build, shape, and manipulate sound from scratch.

If you visit the MASE interface on my media page, you’ll see a control rack that flows logically from left to right, following a classic synthesis signal path:

Oscillators (Sound Generation) -> Audio Mixer -> Biquad Filter (Frequency Shaping) -> VCA Master (Volume Envelope) -> Spatial FX -> Master Output Scope (Visualizer)

Ready to make some noise?  Let’s walk through the engine step-by-step to get you patching your very first custom sound.

Step 1.  Power on the Engine

Before we can generate any audio, we need to unlock the browser’s built in sound capabilities.

At the very top of the interface, you’ll spot a large button labeled “Click to Power Engine & Start AudioContext”.  Give that a click.  You’ll know it worked when the button turns green and reads “Engine Online.”  The rest of the control rack will instantly brighten up, signaling that the interface is unlocked, active and ready to soar.

Step 2.  Establish a Basic Continuous Tone

To understand how we sculpt sound, we need to start with raw material.  Let’s create a simple, static drone.

1. Navigate to the Audio Mixer module.

2. Set Oscillator 1 level to 0.7 and Oscillator 2 level to 0.0.  This isolates our first oscillator so you can hear exactly what it’s doing without distractions.

3. Check the VCA Master module to ensure your Master Gain is turned up (it defaults to a healthy 0.8).

4. Head over to the Oscillator 1 (Carrier) module and experiment with the Waveform dropdown menu to hear the different mathematical foundations of synthesis.

5. Sine: Clean, smooth, and perfect for deep bass.

6. Sawtooth:  Bright, buzzy and sharp - the absolute best choice for carving up with filters later.

7. Triangle:  A flute-like, soft, and mellow tone.

8. Square:  Hollow, woody, and instantly redolent of retro chiptune and 8-bit video games.

Step 3.  Trigger the 8-Step Sequencer

Drones are great, but music moves!  Instead of forcing you to click individual keys, MASE features a built-in automated timeline player to trigger notes in succession.

Find the Clock & 8 Step Sequencer module and click “Run Clock”.  You’ll see a row of green LEDs begin flashing rhythmically from left to right.

• Change the Speed.  Adjust the Beats Per Minute (BPM) slider to speed up or slow down your loop (ranging from a steady 60 to a frantic 240 BPM).

• Create a Melody.  Move any of the 8 vertical sliders up or down.  Raising a slider increases the pitch value of that specific step.

• Transpose.  Want to shift the vibe?  Go back to the Oscillator 1 module and adjust the Coarse Tune slider to shift your entire melody up or down in semi-tones (up to two octaves in either direction).

Step 4.  Shape the Dynamics (The Volume Envelope)

Every time the sequencer moves to a new step, it fires an AHD (Attack, Hold, Decay) volume envelope.  This acts as an automated hand on the volume knob, dictating how a sound punches and fades over time.

Locate the Envelope (AHD) module and try dialing in these two classic shapes:

• The Plucky / Percussive Sound:  Set Attack to minimum (0.01s), Hold to minimum (0.00s), and Decay to low (0.20s - 0.40s).  This gives you tight, bouncy, staccato notes.

• Soft / Ambient Swells:  Set Attack to high (0.50s), Hold to medium (0.20s), and Decay high (1.00s or higher).  The notes will gently fade in and melt into one another, perfect for cinematic soundscapes.  This works beautifully when the sequencer clock is set to a slower tempo, like 60 BPM.

Step 5.  Sculpt Frequencies with the Filter

Now that we have rhythm and shape, let’s alter the actual colour of the sound using the Biquad Filter.  Filters work by blocking certain frequency ranges and letting others pass through.

Select Lowpass from the filter Type dropdown menus.  As the name implies, this lets the low frequencies through while blocking the bright highs.  However, this is all to personal taste.  Experiment!

With your sequencer running, slowly drag the Cutoff slider back and forth.  You’ll hear the sound morph from a muffled, deep, underwater thud (60 Hz) to a bright, wide open buzz (8000 Hz).

To give it the classic “synth” character, turn up the Resonance (Q) slider to around 5 or higher.  This creates a sharp volume boost right at the cutoff point, adding an aggressive, synthetic “squelch” or “wow” effect as you sweep the slider.

Step 6.  Introduce Frequency Modulation (FM Synthesis)

Ready to get weird?  We can use Oscillator 2 to rapidly modulate the frequency (pitch) of Oscillator 1, creating complex, metallic, or industrial timbres.  This is the foundation of FM synthesis.

First, an insider tip:  Go to the Audio Mixer and keep Oscillator 2’s volume low or completely off.  It doesn’t need to be audible in the mixer to modulate Oscillator 1!

Now, find the Oscillator 2 (Modulator) module:

1. Turn up the FM Depth slider from 0 towards 1000.

2. Adjust the Frequency Offset multiplier slider (e.g. 2.0x).  This determines how many times faster Oscillator 2 vibrates relative to Oscillator 1.

As you push the depth higher, you’ll hear the melody morph from a simple pitch vibrato into a rich, complex, harmonic snarl.

**Added bonus, try experimenting with the Amplitude Modulation slider as well for a completely different, tremolo-like ring modulation effect!

Step 7.  Add Space and Depth (FX & Scope)

The final step is all about polish.  The Spatial FX panel gives your dry synth patch a sense of physical dimension and space.

• Delay:  Increase the Delay Time (rhythmic spacing) and Delay Feedback (the number of echo repeats) to introduce echoes that bounce playfully behind your melody.

• Reverb:  Raise the Reverb Mix percentage slider.  This routes your audio through a synthetic 2.5 - second ambient room simulation, giving the sound a lush, dreamy space.

Monitor Your Creation:  As you play, keep your eyes on the Master Output Scope at the bottom of the page.  This live oscilloscope renders your generated sound waves in real-time teal green.  It’s an immediate, hypnotic visual representation of the audio waves you just built from scratch.

What will you build?

The beauty of the modular engine like MASE is that there are no wrong answers.  An extra millimeter of FM depth or a slight tweak to the filter cutoff can completely transform a patch from a soothing ambient lullaby into a sci-fi baseline.

Head over to the media page, power up the engine, and let me know what kinds of sounds you manage to sculpt!