SPAN Plus offers a highly customizable spectrum analyzer with a flexible mode system, allowing users to tailor their analysis experience. You can adjust settings such as Fourier block size, FFT window overlap, and the visual slope of the spectrum to suit different audio inspection needs. The plugin supports various types of secondary spectrum displays, including real-time and all-time maximums, and features visual smoothing options to simplify spectrum examination.

Designed for multi-channel environments, SPAN Plus can show spectrums from two separate channels or channel groups simultaneously, with customizable color options for clear differentiation. Its output level metering includes adjustable ballistics and integration time, alongside advanced K-metering with calibration capabilities. The plugin also provides comprehensive level metering statistics, headroom estimation, clipping detection, and correlation metering for in-depth signal analysis.

Additional features include real-time spectrum import and export, PNG file saving, static spectrum display, and output signal power statistics. The interface is resizable and supports multiple sample rates, with internal channel routing, grouping, and mid/side analysis. SPAN Plus also offers a preset manager, undo/redo history, A/B comparisons, and contextual hints to enhance workflow efficiency and precision in audio analysis.