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I have been using the REW5 Spectrum Analyzer and comparing it to that of Virtins Multi-Instrument both with an external EMU0404 soundcard in 24-bit mode. Generally, the calculation of THD agrees between both but the THD+N as calculated by REW5 is always much higher (more than a factor of 2). Is the REW5 Signal Generator a 16 bit generator or does it run in 24 bit mode when using ASIO drivers for the external sound card?
 

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Using V5.01 beta, bit width and dither are selected from the controls on the generator, the bit depth the audio interface is actually running at is shown at the left side of the status bar, bottom of the main window.
 
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