Daniel Dehaan

Week-06

Overview

This week provides a comprehensive exploration of audio effects—the tools that shape, enhance, and transform sound. We’ll examine EQ, dynamics processing, saturation, modulation effects, and time-based effects, understanding not just how they work but when and why to use them in different contexts.

Learning Objectives

By the end of this session, students will be able to:

  • Explain the function and parameters of major effect categories
  • Apply EQ strategically to solve problems and enhance tone
  • Use dynamics processing to control and shape audio
  • Apply time-based and modulation effects for depth and character

Topics Covered

Equalization (EQ)

Types of EQ

  • Parametric EQ (frequency, gain, Q/bandwidth)
  • Graphic EQ
  • Shelving EQ (high/low shelf)
  • High-pass and low-pass filters

EQ Applications

  • Corrective EQ (removing problems)
  • Tonal EQ (shaping character)
  • Surgical EQ (targeting specific frequencies)
  • Creative EQ (dramatic coloration)

Key Frequency Ranges

  • Sub-bass (20-60Hz): Weight, rumble
  • Bass (60-250Hz): Warmth, body
  • Low-mids (250-500Hz): Fullness, mud
  • Mids (500Hz-2kHz): Presence, clarity
  • Upper-mids (2-4kHz): Bite, intelligibility
  • Highs (4-10kHz): Brilliance, air
  • Ultra-highs (10-20kHz): Sparkle, air

Dynamics Processing

Compression

  • Threshold, ratio, attack, release
  • When to compress (controlling dynamics)
  • Parallel compression
  • Multiband compression

Limiting

  • Brick-wall limiting
  • Loudness maximization
  • Protecting against clipping

Expansion and Gating

  • Noise reduction
  • Tightening transients
  • Creative gating effects

Saturation and Distortion

Types

  • Tape saturation
  • Tube saturation
  • Transistor/solid-state
  • Digital clipping
  • Bit-crushing

Applications

  • Adding warmth and harmonics
  • Gluing elements together
  • Creating aggression
  • Lo-fi aesthetics

Modulation Effects

Chorus

  • Multiple detuned copies
  • Width and depth
  • Thickening sounds

Flanger

  • Comb filtering
  • Jet-sweep effect
  • Feedback parameter

Phaser

  • All-pass filters
  • Sweeping notches
  • Subtle to dramatic

Tremolo and Vibrato

  • Amplitude modulation (tremolo)
  • Pitch modulation (vibrato)
  • Rate and depth

Time-Based Effects

Reverb

  • Room types (hall, plate, chamber, spring)
  • Key parameters (size, decay, pre-delay, damping)
  • Algorithmic vs. convolution
  • Creating space and depth

Delay

  • Simple delay
  • Ping-pong delay
  • Tape delay character
  • Sync to tempo
  • Feedback and filtering

Resources

⚠️ Additional Resources Needed

Add links to specific effect demonstration videos.

In-Class Activity

Effects Exploration Workshop

Part 1: EQ Surgery (20 min)

Work with a provided multi-track session:

  1. Identify problems by sweeping a narrow boost

    • Find mud in the low-mids
    • Find harshness in the upper-mids
    • Find rumble in the sub-bass

  2. Apply corrective EQ

    • Cut problematic frequencies
    • Use high-pass filters where appropriate
    • Add subtle enhancements

  3. Compare before/after using bypass

Part 2: Compression Control (20 min)

Practice compression on different sources:

  1. Vocal/dialogue track

    • Goal: Even out dynamics
    • Settings: Moderate ratio (3:1-4:1), medium attack, medium release
    • Aim for 3-6dB gain reduction on peaks

  2. Drum bus

    • Goal: Add punch and glue
    • Settings: Lower ratio (2:1-3:1), slower attack (let transients through)
    • Listen for the “pumping” effect

  3. Compare parallel compression

    • Blend heavily compressed signal with original
    • Notice how it adds density without killing dynamics

Part 3: Saturation Comparison (15 min)

Apply different saturation types to the same source:

  1. Clean reference (no saturation)
  2. Tape saturation (warm, smooth)
  3. Tube saturation (rich harmonics)
  4. Transistor/console (aggressive)
  5. Bit-crushing (lo-fi, digital)

Note the character of each and when you might use them.

Part 4: Time-Based Effects (20 min)

Create depth with reverb and delay:

  1. Reverb design

    • Start with a room or hall preset
    • Adjust decay time for the context
    • Use pre-delay to maintain clarity
    • EQ the reverb (roll off lows and highs)

  2. Delay as rhythm

    • Sync delay to tempo
    • Use feedback for repeats
    • Filter the delays for depth
    • Try ping-pong for width

  3. Combine reverb and delay

    • Short delay → reverb chain
    • Create sense of space and dimension

Part 5: Effect Chain Design (15 min)

Design a processing chain for a specific sound:

Choose one:

  • Cinematic pad: EQ → Saturation → Chorus → Reverb
  • Punchy drum bus: High-pass → Compression → Saturation → Limiter
  • Lo-fi vocal: Bit-crush → EQ (telephone) → Spring reverb
  • Ethereal texture: Pitch shift → Delay → Reverb → Tremolo

Document your chain and settings.

Deliverable: Processed audio examples demonstrating at least 3 different effect applications.