How to Remove Passing Aircraft from a Quiet Rain Recording Without Smearing the Ambience
To reduce an aircraft in a quiet rain recording, work only on the moments when it passes. First compare the sound in the recording with the spectrogram, then try a short fade or a modest local reduction. Keep the untouched rain as your reference and stop when further cleanup starts to thin, pulse or blur it. Because rain and aircraft overlap across frequencies, complete removal may not be possible without changing the ambience.
Why a passing aircraft is hard to remove cleanly
A plane is not a steady hiss that sits in one frequency band. As it approaches and recedes, its level and tonal character shift; rain continues underneath it. Reducing everything that resembles the aircraft can also take away rain texture. Audacity’s manual says its Noise Reduction effect is intended for constant background noise and will not work well on changing sounds such as speech or music. It also cautions that spectral selection is best suited to a constant frequency, such as electrical hum, and is not a general fix for traffic-like sound. Audacity: Alternative Noise Reduction Techniques
That limitation sets a useful goal: make the aircraft less prominent while preserving the sense of continuous rain. If the plane dominates the recording, overlaps most of the rain, or leaves obvious processing artifacts when reduced, keep some of it. A natural, quieter pass usually fits a personal ambience recording better than an artificial hole.
Start with a safe copy and a listening reference
Duplicate the recording or save a separate working project before editing. Keep the source unchanged so you can compare the processed version with the original. Listen once from beginning to end at a comfortable playback level, noting where the plane begins, reaches its loudest point and fades away. Mark the edges with a little surrounding rain; those transitions matter as much as the loudest section.
Choose a short rain-only passage near the aircraft for comparison. It is a reference for the recording’s texture, not a noise profile to apply across the whole file. Note the qualities you want to retain: fine patter, low soft wash, stereo width, or changes in rainfall intensity. The aim is to match the plane’s level to the surrounding scene, not to make the rain unnaturally uniform.
Find the aircraft in both sound and spectrogram
Switch the track to Spectrogram or Multi-view in Audacity’s track menu. The waveform helps show the overall rise and fall in level; the spectrogram displays frequency content over time. Audacity explains that spectrograms use an FFT and that window size trades time detail against frequency detail: a larger window clarifies frequency components but makes brief events less distinct. Audacity: Spectrogram View
Look for a broad, evolving band or set of bands that appears and changes with the audible aircraft. Do not assume that every bright region belongs to the plane: individual raindrops and changes in the rain bed can also create visible energy. Use the display to locate and understand the event, then confirm by listening. A display setting changes what you see; it does not separate the aircraft from rain by itself.
Try the least destructive edit first
If the plane is only briefly distracting, use a gentle volume reduction over the pass. Select the event plus the transition margins and lower its level with volume automation or an envelope tool, if your editor provides one. Shape the gain gradually so it falls as the aircraft grows noticeable and rises again as it recedes. Avoid cutting the entire interval to silence: the rain would disappear with the plane, creating a conspicuous gap.
Make a small adjustment, then listen to the transition in context, including a few seconds before and after. Compare the edited pass with the original at the same playback level. If the aircraft is less forward and the rain remains continuous, the edit may be finished. If you hear a sudden dip, pumping, or a change in rain density, soften the curve or reduce the amount of attenuation.
Use spectral repair only on separable details
When the spectrogram reveals a distinct tonal trace that you can isolate from the rain, a spectral tool may help. Audacity’s spectral selection lets you select a time range and frequency range, but its manual warns that general spectral editing is not suited to complex traffic-like sounds. Avoid drawing a large selection around the whole pass and applying a hard delete; that risks cutting useful rain along with the aircraft. Audacity: Spectral Selection and Editing
If you have software with spectral repair, select only a clearly identifiable portion and start with attenuation rather than replacement. iZotope’s RX 6 documentation describes its Attenuate mode as reducing selected spectral magnitudes toward surrounding material without resynthesizing the audio; it is intended for background-noise situations where the wanted signal is not completely obscured. That is a possible fit for a narrow, identifiable component, not a promise that a whole aircraft can be removed transparently. iZotope: Spectral Repair
Check for smearing, holes and tonal changes
After each edit, listen at normal speed on headphones or speakers you know well. Check the aircraft’s onset and tail, where abrupt edits and processing artifacts are easiest to notice. Listen for a rain bed that suddenly dulls, becomes watery or swells unnaturally; for a hollow gap; and for a metallic or fluttering residue. Toggle between edited and original versions without changing playback level, since a quieter version can seem cleaner simply because it is quieter.
If an edit damages the rain, undo it and try a shallower reduction or shorter, more targeted selection. Avoid stacking broad noise reduction with spectral cuts and volume changes before checking each step: several mild edits can cumulatively make the ambience sound processed. Keep a version of the project with the edits reversible if possible.
Decide when to stop—or use another take
Stop when the aircraft sits farther back and the rain still sounds like the same continuous place. Some aircraft may remain audible; that is preferable to removing the rain that masks them or leaving an obvious processed patch. If the pass occupies most of the clip or its sound is inseparable from the rain, consider using another rain-only section from the same recording to shorten the finished piece, with gradual fades at the join. Match the rain’s level and texture by ear, and reject the splice if it creates a new jump in the ambience.
For future recordings, capture more than one stretch of rain and keep a few seconds of uninterrupted ambience before and after the desired moment. That gives you options for trimming and transitions without requiring aggressive cleanup. For this recording, the best result is the lightest edit that makes the aircraft less distracting while leaving the rain’s natural variation intact.