ListenAid vs ScopeNode

ListenAid - intuitive & clean realtime audio spectrum analysis. ListenAid is an acoustic visualization tool optimized for live sound engineering and system tuning (leveraging transfer functions and multi-resolution processing), delivering maximum performance through Metal and Accelerate hardware acceleration. Audio Engine & Core DSP • Lock-Free Processing (RingBuffer): non-blocking, zero-dropout audio. • Low-Level Math (vDSP): minimal CPU load • Real-Time Transfer Function: Live reference vs. live channel division: instantly shows frequency responses differences 5 different Analysis models: • STFT: Standard Short-Time Fourier Transform. • CWT: Continuous Wavelet Transform for high-frequency time resolution; optimized via integral images. • CQT: Constant-Q Transform with variable smoothing. • QTAM: Amplitude demodulation in the frequency domain. • Multi-Resolution: Concurrent Low, Mid, and High FFT windows for low-end frequency and high-end time resolution. Metal GPU Rendering • Spectrogram is GPU-offloaded; maintains 60 FPS even at massive bin sizes • Phase Reassignment: Analyzes frame phase differences, shifts energy to exact sub-bin frequencies to sharpen visual traces • Simultaneous FFT Traces: Concurrently plots Live, Reference, and Secondary traces with customizable colors and opacities • Dynamic Viewport (ViewportMath): Continuous pan and zoom Analytical Tools & Precision • Sub-Bin Peak Detection: Calculates precise peak frequencies using FFT phase correction or logarithmic-parabolic interpolation • Pitch Conversion (FrequencyConverter): translates frequency peaks to notes, showing cent deviations (with adjustable concert pitch) • Weighting & Tilt: A- and C-Weighting filters; adjustable display tilt • Smoothing & Averaging: Exponential, RMS, LUFS, Leq or Peak Hold averaging; psychoacoustic fractional octave smoothing (1/96 to 1 full octave). System Tests & Signal Generation • Sine Generator: Artifact-free oscillator with amplitude fade envelopes; outputs up to the Nyquist frequency • Channel Control (SystemTestManager): Routes the generator or loop player via Normal, Solo L/R, or Phase Invert • Loop Playback: Imports and loops custom audio files to test spaces using known reference tracks Workflow & Connectivity • Multipeer Control (MultipeerManager): fully remote-control another instance at the mixing desk (volume, mute, generator, playback) • Smart Routing: AudioEngine safely intercepts hardware changes and manages BT profiles • Preset System: Instantly save and recall all DSP and UI configurations via slots A, B, and Y.

ScopeNode is a multi-input oscilloscope, capable of visualizing multiple tracks layered on top of each other. The plugin features a suite of phase alignment tools built around an interactive visual workflow tailored specifically for the low end. These can help eliminate low-frequency clashes at the source so your tracks layer perfectly without heavy reliance on aggressive sidechain dips. The result is a much smoother, more fluid bass response. Beyond phase alignment, ScopeNode is perfect for visualizing how individual components line up, checking delays between signal points, or analyzing precise pre and post waveform differences across third-party plugins or subchains. FEATURES: - Free-Running & Beat-Synced Modes - 4-Layer Scope Matrix + Live Summing: Layer up to four audio tracks simultaneously with a real-time composite summing view for instant clash detection - Separate controls for visualization and sum inclusion to accommodate special use cases (optional) - Phase shifter with configurable center frequency and Q factor (one per track) - Sample grid delay, phase invert, gain control also available for each track - Multi-instance workflow: Drop plugin instances ("probes") anywhere in your signal paths to capture and compare tracks instantly TECHNICAL NOTES: - When enabled, it's recommended to verify that Plug-in Latency Compensation is not affecting synchronization in unexpected ways with the given set of active third-party plugins - Manual phase alignment is an advanced, hands-on process that requires time and active engineering effort, depending on the complexity of the tracks involved - Workflows could be greatly impacted by specific features of your DAW, e.g. ease of automation envelope editing, ways of laying out multiple viewports, etc. PLEASE NOTE: • An AUv3-compatible host is required to use this app (true interoperability can vary across different apps) • Please check our support page for a list of compatible host applications • Officially supported sampling rates: 44.1, 48, 96 kHz