AtSpec Pro is an audio bandwidth FFT-based (Fast Fourier Transform) spectrum analysis tool which allows you to perform noise and distortion analysis, measure the performance of loudspeaker systems, take frequency response and impulse measurements, and more. The program supports both stable and exponential (auto-regressive) averaging modes\; implements a true linear correlator, not just the circular variety\; includes automatic dB (Decibel) scaling and logging\; and features zoom in and out capabilities. AtSpec Pro also includes printing capability, the ability to copy graphs to the Clipboard, harmonic data relationship cursor highlighting, and user-selectable graph colors and fonts. You can save your spectrum analysis session data, automatically reject saturated data, place data markers on graphs, export your graphs and data to CSV text files, and calibrate your input devices. In addition, the program supports the following graphs: instantaneous spectrum, cross spectral density, coherent power, coherence, cross correlation, impulse response, and more.