Zelscope is a reliable and handy program that helps convert your traditional computer into a spectrum analyser and trace storage oscilloscope. The analyser would display the phase components and amplitude of the spectrum. The interface is like a conventional oscilloscope, with trigger controls, conventional gain, timebase, and offset. The display of the oscilloscope is responsive and clear, with sliders and dials added. Also, this application needs a drivers-installed sound card, which is used to examine speech, music, or circuit output.