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Mac the Scope Screen Shot

Spectrum analyzer, dot envelope display.

Envelope display mode causes each new analysis trace to overwrite the previous display (traces accumulate on the display).

Here, dot trace display mode was used in conjunction with a time base expansion of X32 to examine the low frequency content of an audio recording. The recording contained low frequency keyboard bass notes, with appreciable fundamental content down to ca. 25 Hz (frequency resolution was 0.67 Hz).