Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.
This software is a shareware. You will be able to download and test Audio Spectrum Analyzer during a certain period of time, then, if it does what you need, you will have to acquire the full version from Audio Spectrum Analyzer publisher. The Audio Spectrum Analyzer 5.60 free trial version contains an installer, and has a size of 583 Kilobytes.
For additional information and support request, please contact directly Audio Spectrum Analyzer publisher.

Audio Spectrum Analyzer Screenshot