Unified display
Scope, spectrum, and meters share one window: the whole picture without juggling plugins or windows.
DELTASCOPE
Free demo available on desktopsDownload Demo
See the difference
DELTASCOPE
Audio Analyser & Null Test Plugin
Scope, spectrum, and metering in a single view. Route a second signal in and see exactly what your processing changes in time, frequency, and phase. The visual feedback you need to make confident mix decisions.
Latestv1.1.0·24 Jul 2026·What's new ›·Manual ›
Combine ModesFive ways to view two signals, including Delta mode, which isolates exactly what changed. Listen to the difference signal, or just watch it.
MeasurementDrag across a waveform to read frequency, note name, amplitude, and duration, accurate to a tenth of a cent.
MeteringSeven modes from sample peak to integrated loudness. Readings that match your delivery spec.
Compare any two signals
Route a second signal via sidechain or link to another instance on any track. No bus routing required.
Measure, don't guess
Frequency, amplitude, phase, and duration: read directly from the waveform. Alt+hover locks to a single cycle instantly.
Overview
See the difference
DeltaScope is an audio analyser that shows you what your processing is actually doing. Null test any two signals: switch to Delta mode to see, and optionally hear, exactly what changed. Isolate frequency bands, map phase correlation across time, and measure directly from the waveform. Zero latency. Minimal CPU.
- Beat-synced or free-running, full screen up to 4K, zero latency
- Five combine modes: overlay, stack, sum, delta, sum+delta split, with optional delta monitoring and independent channel on/off
- Band filters isolate any frequency range without smearing the display
- Phase correlation mapped across time, see where signals reinforce and where they cancel
Compare any two signals
No bus routing. No setup. Just drop it on two tracks.
Place DeltaScope on two tracks and they find each other automatically, by track name. Or route any signal via sidechain. Either way, you're comparing in seconds.
Five combine modes
Overlay, stack, sum, delta, and sum+delta split. Show or hide each channel independently. Because the relationship between two signals is rarely captured by a single view.
Instance linking
Instances find each other automatically by track name, just drop and compare.
Delta mode: a true null test
Your processed signal minus the original: see and hear exactly what changed. What the compressor took away. What the EQ reshaped. What the limiter caught. Route the difference to your monitors to listen critically, or just watch it on screen.
Automatic delay compensation
Latency differences between tracks are detected and corrected automatically, even across different plugin chains.
Isolate what matters
Focus on the frequency range you care about, the display stays accurate.
High-pass and low-pass filters on both main and sidechain channels. Narrow your view to any frequency range, the waveform stays clean, phase-accurate, and free of artefacts.
Band filtering
Isolate any frequency range from 20 Hz to 20 kHz. At default positions the filters bypass completely, no processing overhead.
Dual-thumb slider
Drag individual cutoffs or drag the band between them to shift the window while preserving bandwidth.
Band link
Lock main and sidechain filters together so adjusting either one moves both. Compare the same frequency range across two signals.
Accurate display
The filters don't smear the waveform or shift the phase, what you see on screen is what's actually in the signal.
Measure, don't guess
Drag across any region of the waveform for instant readouts.
Selection edges snap to zero crossings automatically. The readout appears instantly: frequency, MIDI note with cents deviation, cycle count, peak/trough/RMS amplitude, and duration in ms or beats.
Sub-cent accuracy
Frequency detection works directly on the waveform, accurate to fractions of a cent on sustained tones, with no resolution limits.
Smart snapping
Selection edges lock to the fundamental's zero crossings, not harmonic crossings, so your measurement always frames the right cycle.
Single-cycle detection
Alt+hover for instant single-cycle detection at the cursor without dragging.
Split-view measurement
In split-view modes, each lane measures its own signal independently.
Map phase correlation
See where signals reinforce and where they cancel, not just that they do.
Most correlation meters give you a single number for your entire signal. DeltaScope maps correlation across time, so you can see exactly which moments cause problems.
Bar graph mode
Vertical bars along the timeline, gold where signals reinforce, red where they cancel.
Heat-fill gradient
A continuous colour field showing correlation intensity across time, spot trouble at a glance.
Adjustable detail
Control the resolution, weighting, and blend to match the level of detail you need.
Band-filtered correlation
Link correlation to the band filters to focus on a specific range, spot exactly where problems are so you know what to fix.
See the spectrum
View one signal's spectrum, or compare two.
A full spectrum analyser, in the same window as the scope. Read one signal on its own, or switch to Delta mode and compare two, to see exactly what changed between them, frequency by frequency.
Delta spectrum
The Difference view is the scope's Delta in the frequency domain, the spectrum of what's different between two signals. It reacts to timing as well as level, so it catches phase and alignment issues, not just tone.
Magnitude transfer
Put DeltaScope pre and post your processing and see the exact frequency changes it's making, great for verifying Pultec EQ moves, what a compressor reshapes, what your chain does to the tone. Phase shifts read flat, so a curve means real tone changes, not timing.
Per-channel curves
Each channel on its own curve, Left and Right in Stereo, Mid and Side in Mid-Side. A difference that affects only one side shows up exactly where it happens.
Live crosshair
A crosshair reads frequency, note, and dB under the pointer, plus each band's Max, Min, and RMS, so you see how much it moves, not just where it sits. Hold Option to snap to the nearest peak.
Monitor levels
Seven measurement modes in one meter strip.
Sample peak, RMS, true peak, crest factor, and LUFS: all in one meter strip. Show or hide it with a single click.
Broadcast-standard loudness
LUFS momentary, short-term, and integrated, readings that match streaming and broadcast delivery specs.
True peak
Catches intersample peaks that standard sample-level meters miss.
Crest factor
Peak-to-RMS ratio, see your dynamic range at a glance.
Independent panel
A slim strip beside the scope and spectrum, full delivery metering that never takes over the display.
Make it yours
Control what you see, how you see it, and nothing else.
Show scope, spectrum, or both, drag the divider to set the ratio. Choose your waveform colours. Add analogue glow. Strip the interface down to nothing. Save any setup as default so every new instance starts the way you like.
Flexible layout
Drag the divider between scope and spectrum. Show one, both, or toggle the meter strip, the display adapts to your workflow.
Custom colours
Pick your own waveform colours for main and sidechain channels independently.
Analogue glow
Add CRT-style phosphor glow for a classic oscilloscope feel. Adjustable intensity.
Naked mode
Hide all UI chrome, just the waveform, the spectrum, or both. Clean output for video content, tutorials, and livestreams.
Capabilities
What it does
Beat-sync
22 divisions (straight, dotted, and triplet) from 1/128th note to 16 bars. Transients lock to the same position every cycle.
Zoom and pan
Scroll to zoom up to 64× magnification. Cmd+drag to pan. Double-click to reset.
Your interface
Custom colours, analogue glow, full screen to 4K, or Naked Mode: set the display up your way and save it as the default.
Zero latency
Minimal CPU. Light enough to run on every track that matters.
Support
Zero fluff (no-nonsense)
Compatibility
VST3 and AU. macOS 13 Ventura or later, Intel and Apple Silicon native.
Licensing
One licence key, activated locally in the plugin. Simple, fast, no account required.
Support
Direct email support. Feature requests welcome.
Coming soon
Windows, AAX, and CLAP support are on the way.
Comparison
Scope vs DeltaScope
Scope is the free oscilloscope; DeltaScope adds the full audio analyser toolset: null testing, spectrum, metering, and measurement.
| Feature | Scope | DeltaScope |
|---|---|---|
| Display | ||
| Full visual quality | ✓ | ✓ |
| Fully resizable window | ✓ | ✓ |
| All sync divisions (1/128 – 16 bars) | ✓ | ✓ |
| MIDI-synced timebase (note-locked, phase-aligned) | — | ✓ |
| MIDI octave offset (±4 octaves) | — | ✓ |
| Gain control | ✓ | ✓ |
| Clip overlay (on the waveform) | ✓ | ✓ |
| Clip border | ✓ | ✓ |
| Custom waveform colours | ✓ | ✓ |
| Adjustable waveform glow | ✓ | ✓ |
| Naked mode (hide all UI chrome) | — | ✓ |
| Channel Modes | ||
| L / R / Mono / Stereo | ✓ | ✓ |
| Mid / Side | — | ✓ |
| Analysis | ||
| Freeze + hold | — | ✓ |
| Zoom + pan | — | ✓ |
| Measurement overlay | — | ✓ |
| Spectrum analyser | — | ✓ |
| Delta spectrum (difference + magnitude) | — | ✓ |
| Phase correlation meter | — | ✓ |
| Level meter | — | ✓ |
| Routing | ||
| Sidechain input | — | ✓ |
| Inter-instance audio sharing | — | ✓ |
| Sum + difference (delta) modes with delta monitoring | — | ✓ |
| Processing | ||
| LP / HP band filter | — | ✓ |
| Manual sample / ms offset | ✓ | ✓ |
| Auto sample delay compensation | — | ✓ |
| Formats | ||
| VST3 | ✓ | ✓ |
| AU | ✓ | ✓ |
Complete the workflow
DeltaScope shows the problem. Align fixes it.
Align is the corrective half of the workflow: sub-sample delay, broadband phase rotation, and per-channel polarity, set against a live phase curve.
Meet Align ›Still got questions? Read the Manual, or check our FAQ and Refund Policy