StretchLearn Course

Rescue noisy recordings the way restoration pros do

A tool-by-tool, problem-by-problem system for clean dialogue and music using iZotope RX and free Audacity workflows.

Beginner9 hrSelf PacedRegistered

Course Overview

What this course is designed to develop

This course teaches the complete audio-restoration pipeline a working editor runs on damaged dialogue and music, from diagnosing a problem on the spectrogram to applying the right repair module in the right order. You will use named tools including iZotope RX, Audacity, and the Youlean Loudness Meter, and the specific numbers that separate clean repair from over-processed, watery artifacts. By the end you can fix 50/60 Hz hum, remove clicks and mouth noise, recover clipped peaks, and reduce broadband noise without destroying the source.

Learning Outcomes

What the learner should be able to understand, build, or execute.

Diagnose hum, clicks, clipping, and broadband noise by reading a spectrogram

Remove 50/60 Hz mains hum and its harmonics without thinning the voice

Repair clicks, crackle, and mouth noise using De-click and spectral tools

Recover clipped and distorted peaks with De-clip and gain staging

Reduce broadband background noise to a clean floor without watery artifacts

Build a repeatable restoration chain and export to broadcast loudness targets

Curriculum Preview

Inside the curriculum: a structured path from fundamentals to execution.

Preview the course structure, see how the modules build on one another, and understand the path this program is designed to take you through.

Module 1

Module 1: Listening, Diagnosis, and Your Restoration Toolkit

Set up your tools and learn to identify every defect on the waveform and spectrogram before you touch a single repair, so you fix the real problem instead of guessing.

3 lessons

The Restoration Mindset and the Order of OperationsContent · 45 min

Preview Enabled

Setting Up iZotope RX and AudacityContent · 45 min

LMS Access

Reading the Spectrogram to Identify DefectsContent · 45 min

LMS Access

Module 2

Module 2: Removing Hum, Clicks, and Impulsive Noise

Master the tonal and transient repairs that come first in the chain: mains hum and its harmonics, vinyl crackle, digital ticks, and distracting mouth clicks.

3 lessons

De-Humming: Killing 50/60 Hz Mains BuzzContent · 45 min

LMS Access

De-Clicking: Crackle, Ticks, and Digital PopsContent · 45 min

LMS Access

Spectral Repair: Painting Out One-Off NoisesContent · 45 min

LMS Access

Module 3

Module 3: Clipping, Distortion, and Broadband Noise

Reconstruct overloaded peaks and reduce the constant hiss and rumble that sits under a recording, finishing the heavy lifting of the restoration chain.

3 lessons

De-Clipping: Rebuilding Distorted PeaksContent · 45 min

LMS Access

Broadband Noise Reduction Without ArtifactsContent · 45 min

LMS Access

Reverb, Wind, and Special Problem SoundsContent · 45 min

LMS Access

Module 4

Module 4: Workflow, Quality Control, and Delivery

Assemble everything into a repeatable chain, run a disciplined quality-control pass, level to delivery loudness, and export the right file for the destination.

3 lessons

Building Your Repeatable Restoration ChainContent · 45 min

LMS Access

Quality Control and Trusting Your EarsContent · 45 min

LMS Access

Loudness, Export, and DeliverablesContent · 45 min

LMS Access

Built for Application

A complete learning path, not a one-off inspiration hit.

This program is designed around progression: focused lessons, structured modules, applied resources, assessments, and a course rhythm that turns information into usable capability.

audio restorationnoise reductioniZotope RXAudacityspectral repairde-humde-clickdialogue cleanup