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xoscope is a digital real-time oscilloscope. It graphically displays
signal amplitude or bit logic as a function of time. Signals may be
displayed, saved, recalled, and manipulated by math functions.
Signal input devices currently include /dev/dsp, EsounD,
ProbeScope/OsziFOX, Bitscope, and COMEDI.
If you use your sound card as the input, consider building this buffer
circuit to protect it from overvoltage: