Modifying audio files is not a skill reserved for audio engineers. The core tasks, cutting out dead air, reducing background noise, balancing levels, exporting a clean final file, are learnable by anyone willing to spend a few hours in the right software.
For B2B podcast teams, audio modification happens at several points in the production cycle: cleaning up a raw interview, preparing a clip for social media, adjusting levels on a guest's recording that came in too quiet, or trimming an episode to a target length. Each of these is a distinct task, and each has a straightforward method.
This guide walks through the most common audio modification tasks, what software to use, and the specific steps to complete each one.
The phrase covers a wide range of operations. For podcast production, the relevant tasks are:
Not every project requires all of these. A clean recording from a professional studio setup may only need cutting and normalization before it is ready to publish. A guest recording from a noisy home office may need aggressive noise reduction before anything else is possible.
The right software depends on your team's technical comfort level and workflow requirements.
Audacity is the most accessible free option. It handles every modification task listed above, runs on Mac, Windows, and Linux, and has a large library of tutorials and documentation. If you are new to audio editing and want to learn, Audacity is the right starting point.
Adobe Audition is the professional standard. It offers more powerful tools than Audacity, particularly for noise reduction and spectral editing, and integrates with other Adobe products. It costs approximately $23/month as a standalone subscription.
Descript approaches audio modification differently: you edit the transcript (the text), and the audio is cut accordingly. For teams who find waveform editing unintuitive, Descript's approach significantly lowers the skill threshold. Filler word removal is automated. Silence trimming is a one-click operation.
GarageBand (Mac only, free) is a solid alternative to Audacity for Mac users and handles multi-track sessions well.
For deeper comparisons of these tools, the podcast editing and post-production guide covers each in detail.
In any audio editor, the first step is importing the file you want to modify.
In Audacity:
In Adobe Audition:
Practical note: Work with uncompressed or lossless files (WAV or AIFF) when possible. If you import an MP3, edit it, and export as an MP3, you lose quality each time due to re-compression. If your only source file is an MP3, export your edited version as WAV or at the highest MP3 quality setting available.
Before any audio processing, do the structural editing first. Clean up the recording so it contains only what you want.
Cutting unwanted sections:
In Audacity or Audition, you can select any region of audio by clicking and dragging across the waveform. Once selected:
For podcast editing, the most common cuts are:
Using the cursor and zoom:
Audio editing requires precision. Use the zoom controls (Ctrl+Scroll in most editors) to zoom in on the waveform so you can make clean cuts at natural pauses rather than mid-word. Cutting mid-word sounds abrupt; cutting at a natural pause sounds like a natural edit.
Multi-track audio:
If you recorded your interview with separate tracks per speaker (the recommended approach), each track appears in its own row. You can edit each track independently. Cuts on one track do not affect the other unless you explicitly apply them to both.
Background noise reduction is one of the most requested audio modifications in podcast production. The standard workflow in Audacity uses a noise profile approach:
Noise reduction in Audacity (step by step):
Noise reduction in Adobe Audition:
Audition has a more powerful noise reduction tool under Effects → Noise Reduction / Restoration. The workflow is similar, capture a noise print from a section of pure background noise, then apply it to the full recording, but Audition's algorithm handles complex noise profiles better and produces fewer artifacts on heavy applications.
AI-based noise reduction:
For teams that do not want to learn manual noise reduction, Adobe Podcast Enhance (free web tool) and Auphonic automate this process. You upload the file, and the tool returns a cleaned version. The quality is excellent for standard podcast use cases and significantly reduces the time required.
Audio levels determine how loud or quiet the recording is. Two issues are common in podcast audio:
Normalization sets the peak level of your audio to a target value. In Audacity: Effect → Normalize. Set the target to -1 dBFS for a recording you plan to edit further, or to the final loudness standard you are targeting.
Loudness normalization (more important than peak normalization for podcasts): Podcast platforms and distribution services measure loudness using LUFS (Loudness Units relative to Full Scale). The standard for podcasts is -16 LUFS for stereo or -19 LUFS for mono. Getting your final export to match this target ensures consistent playback volume across episodes and meets the requirements of major directories.
In Audacity, the Loudness Normalization effect (Effect → Loudness Normalization) lets you set a target LUFS level directly.
Compression: If your recording jumps between very quiet and very loud sections, common in natural conversation where some people speak more quietly than others, compression reduces that dynamic range. In Audacity, the Compressor effect (Effect → Compressor) handles this. For standard podcast use, a ratio of 3:1 to 4:1 with a threshold around -18dB is a reasonable starting point.
EQ (equalization) adjusts the frequency balance of your audio. For voice recording, the most common uses are:
In Audacity: Effect → EQ and Filter → Graphic EQ (or Parametric EQ). In Audition: the Graphic Equalizer and Parametric Equalizer are under Effects → Filter and EQ.
For beginner-level podcast editing, the high-pass filter is the most useful EQ tool and produces clear improvement on most voice recordings. The others are refinements worth learning over time.
Once you have finished editing, export the modified file in the correct format.
Common export formats for podcasts:
In Audacity:
In Adobe Audition:
Guest recording too quiet: Apply Loudness Normalization to bring their track up to match the host's level before mixing.
Recording has a constant electrical hum (60Hz): Use a notch filter at 60Hz (and its harmonic at 120Hz) to remove it. In Audacity: Effect → Notch Filter.
Recorded in the wrong file format: Audacity and Audition can import and export between virtually all common audio formats. Import the file in whatever format you have, edit as needed, and export in the format you need.
Accidental clipping (distortion): Clipping that is already recorded into the file cannot be fully corrected. Light clipping can be reduced using the Clip Fix effect in Audacity or Audition's Repair tools, but severe clipping is usually unrecoverable. The fix is preventing it during recording with proper gain staging.
For B2B teams, the decision comes down to volume and time. If you publish one episode per week and your recordings are consistently clean (remote guests recorded via Riverside, in-person recordings from a controlled environment), learning basic audio modification takes a few hours and ongoing editing stays manageable.
If you publish frequently, have variable recording quality from guests, or need a faster turnaround, outsourcing editing to a production partner recovers significant time. Done-for-you services handle all of the modification steps described here and deliver a final mixed file ready for distribution.
For teams evaluating both options, the podcast editing services guide compares the cost and time implications in detail.
Audio modification is a skill with a learning curve, but the core tasks, cutting, noise reduction, level normalization, and export, are teachable to anyone. Start with those fundamentals, and 80% of editing problems become manageable.
The tools are capable. Free tools like Audacity can produce professional output. The skill is what matters, and it develops quickly once you are working with real episodes.
For beginner-friendly context on the full podcast editing workflow, the podcast editing for beginners guide is a good companion to this one. The amount of modification work you face is directly tied to recording quality, understanding signal chain and microphone placement reduces cleanup time significantly. For software-specific recording choices that affect the files you edit, see the best sound recording software guide.
