OscillometerXZ
OscillometerXZ is an Audio Spectrum Analyzer for Real-time, FFT
Offers several functions like OscilloScope, Frequency counter, voltmeter, noise and distortion meter, phase shift meter.
Run under Windows XP smootly.
It’s also a Multi-Tone Sound Frequency Sweep Generator. White, pink noise.
if you want, you can download Oscillometer