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With this test you have been looking at your sound picture through a magnifying glass. You should be in normal playback mode now. Again you will see that the dialog does not open. To get out of the test mode in WaveLab, just press and hold CONTROL and SHIFT while clicking Options/Preferences again. Nobody's really sure how Apogee's UV22HR (both available in WaveLab) works (except Apogee, and they're not talking), but I rather like it on a lot of things. Weiss designed Pow-r dither Type 3 that way, and Waves Type 1 Ultra is that way. That allows the dither energy to be kept well away from the frequencies at which human hearing is most sensitive. Since noise-shaping is basically filtering, 9th-order noise-shaping is simply dither that has been filtered with a 9th-order (very steep) filter. Actually it modulates all bits! As a result, quantization error at higher bit levels is also largely eliminated, and microdynamic signal fluctuations smaller than actual adjacent bitscale values can be preserved, resulting in a greater clarity and detail at all levels, not just the lowest. It is this capacity of the human ear/brain to distinguish signal from noise, even when the signal is lower in level than the noise, that makes dither work.Ī common misconception about dither is that it only modulates the least significant bit. Waves Type 1/Ultra is very effective at removing quantization error, without being audible at normal listening levels. Basically it filters the dither, and pushes more of the energy up into the harder to hear higher frequencies. Hear the noise? But do you also hear how the signal is now intelligible right through the noise! Now try noise-shaping and hear what that does. Now, if you're using Waves L2, engage Type 1 dither. In fact, you can even turn it down until it's essentially unintelligible from the distortion. You may want to reduce the level of the track even further so the distortion is audible practically all the time. Now play a 24-bit file and listen to the quantization distortion. You may want to open WaveLab's bit meter to verify. Now be sure you have told the plug-in to reduce the bit depth to 16 bits. That is your clue that you have entered into dither test mode. You will notice that the Preferences dialog does not open. To engage the hidden test mode in WaveLab:
#L2 ultramaximizer atten level should be at software#
To perform the test in real time, you need to have some bit-reduction plug-in, such as Waves L2 Ultramaximizer software version, and tell it to decimate to 16 bits, but turn off all its dither and noise-shaping. WaveLab has a hidden feature for auditioning/testing dither.