Every tool in ZEEP

Spec	Value
Internal processing	32-bit float, 48 kHz, stereo
Output protection	Always-on true-peak limiter with a -1 dBTP ceiling
Edit seams	An engine-level fade removes the click at every cut
Loudness metering	ITU BS.1770 LUFS (short-term line, integrated readout) and true peak in dBTP
Recording	48 kHz, 32-bit float, stereo when your mic delivers it
Import	Almost any audio format, and the audio track of a video file
Export from the editor	Into your Library as FLAC (lossless)
Share or save from the Library	MP3 at 128, 192 or 320 kbps; M4A (AAC) at 128, 192 or 256 kbps; WAV (16-bit); FLAC; or the original file
History	Undo and redo for every step, with a list of named steps
Android	Android 9 or newer, phones and tablets

Trim & Cut removes parts of a clip right on its waveform. Double-tap the waveform to mark a position; the marks divide the clip into sections. Cut removes the section the playhead is in. Cut left and Cut right remove the nearest section on that side. A removed section shrinks to a seam with a restore button, so one tap brings it back, even after you close and reopen the tool.

Reach for it when you want to trim the start or end, or take a cough, a click or a mistake out of the middle.

• Preview speed (the gauge icon) slows playback inside the tool so you can find the exact spot. It never changes the clip.
• The waveform colors by spectral prominence here by default, so a word buried in noise shows up by eye and you can drop the mark where it starts.

Denoise keeps the voice and turns everything else down. It runs DeepFilterNet, a machine-learning model trained on speech, entirely on your phone.

Reach for it when one voice sits over steady noise: a fan, a fridge, air conditioning, traffic, hiss.

• Strength goes from 0 to 100%. If the voice sounds watery or robotic, lower it.
• Clean gaps (on by default) makes the silence between words deeper. Consonants get slightly harder; if words sound clipped, turn it off.
• A preview volume control (the speaker icon) turns the preview up so you can judge quiet parts. It is never written to the clip.
• Run Denoise first, before Equalizer, Compress or Volume. They make leftover noise louder.

What it does not do: music and sound effects are not a voice, so Denoise damages them; use the Equalizer's Hiss, Hum or Rumble picks instead. Echo and reverb are part of the voice, so they stay. Clicks and pops are too short to count as noise; cut them out with Trim & Cut.

Strip Silence finds every silent stretch in a clip and removes it. The stretches it will remove show as shaded areas on the waveform before you apply.

Reach for it to tighten a voice recording with long pauses.

• Threshold: -60 to 0 dBFS, default -40. Anything quieter counts as silence.
• Min duration: 0.1 to 2 s. Shorter pauses are left alone, so normal breathing room stays.
• Edge padding: 0 to 500 ms of quiet kept on each side of what remains, so words don't start abruptly.

The Equalizer is a volume control for one part of the sound: turn down what bothers you, lift what's missing. It is a parametric EQ with eight bands (high pass, low shelf, four bells, high shelf, low pass), drawn on a graph over a live analyzer.

Reach for it when a recording sounds boomy, muddy, harsh, dull, or carries a steady low hum.

• Start from Voice or Music; Custom starts flat.
• The white line is the live analyzer. It shows what's in your sound right now, and peaks show where a problem probably lives.
• Quick picks sit on each band's wheel: Hum (EU) at 50 Hz and Hum (US) at 60 Hz for mains hum, Rumble, Plosives, Mud, Boxy, Nasal, Harsh, Sibilance and Hiss to cut, Bass, Warmth, Presence and Air to lift.
• Drag a band on the graph or use its sliders: frequency 20 Hz to 20 kHz, up to 24 dB of boost or cut, Width (Q) 0.3 to 10, and high or low pass slopes of 6, 12, 24 or 48 dB per octave.
• The headphones icon plays only that band, so you can hear what it holds. You can also mute a band, and the bypass icon on the graph compares with the EQ off.
• A mini timeline under the graph plays the clip while you tune.

Two habits from the in-app cheat sheet: cut before you boost, and keep moves small. 2 to 3 dB is a real change.

Compress turns the loud parts down for you, automatically, so quiet and loud moments sit closer together. How fast it reacts decides what you get: a steadier level, or more punch.

Reach for it when talking goes quiet, then loud, when a few sudden peaks jump out, or when drums sound soft.

• Presets: Even out voice (the default), Smooth instrument, Punchy drums, Tame peaks, Glue the mix. Moving a knob off a preset shows Custom. Changing the preset never moves your Threshold.
• Five knobs: Threshold in dBFS (all the way right is Off), Ratio on four stops (2:1, 3:1, 4:1, 8:1), Knee 0 to 30 dB, Attack 0.1 to 100 ms, Release 20 ms to 1 s.
• The gain reduction meter sits at the right edge of the waveform and shows how much Compress is turning the sound down right now. Drag Threshold until the meter stays in the green zone, 2 to 6 dB, on the loud parts.
• Threshold opens at a value estimated from your recording, aimed at the middle of the green zone, and never moves by itself after that.
• Bypass compares with compression off, and the preview volume (up to +24 dB) lets you judge the quiet parts without changing the clip.
• Compress adds no hidden make-up gain. The clip gets quieter; turn Volume back up afterwards.

What it does not do: if a voice dips whenever something loud plays in the same clip, Compress can't tell the two apart.

Volume sets a clip's level from -20 to +40 dB and reads its loudness while you work. The sheet shows the clip's integrated loudness in LUFS and its true peak in dBTP, draws a loudness line and your target band on the waveform, and offers Match: one tap sets the gain that brings the clip to your loudness target (-16 LUFS unless you change it in editor settings).

Reach for it to make clips sit at the same loudness, or to bring a quiet recording up.

• If a clip can't reach the target in one go, ZEEP tells you how far the best result is from it, and you tap Match again to keep adjusting.
• The Volume tile shows the gain and a green or orange dot for whether the clip is on target.
• Fade sits next to it: a linear fade in and fade out of up to 5 s each, shorter on very short clips.

Speed changes tempo from 0.5× to 2× without changing pitch, and you hear it as you drag. Pick the engine mode for your material: Voice (PICOLA) keeps speech clear, Mixed (WSOLA) keeps rhythm tight for beats or voice over music, Music (Phase Vocoder) keeps notes smooth.