Raise the dialog’s offset slider to completely mute the layer’s low-power frequencies. Use the Level Gamma Offset dialog to make the instrument’s weaker frequencies stronger by increasing the layer’s gamma.
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(A pan control would be more practical.) Click on the bass-guitar layer to solo it, raise the layer’s fader to make it louder, or invert the phase to remove the instrument from the full mix.
In SLP’s Mix Channels dialog, you can adjust faders to set the amount of cross-feed the bass will have in the left and right channels of that layer. Say you’ve parsed the bass guitar from a stereo mix into a discrete layer-a Herculean task, as it requires cleanly extracting each note (with its harmonics) in turn for the entire length of the mix. SpectraLayers Pro can also generate noise or a discrete frequency (which you can modulate over time by mouse-dragging up and down in the spectrogram) and add it to existing audio at a level you set in decibels such mayhem is most useful for sound design.
The resulting phase cancellation will mute the extracted elements at SLP’s output.
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After extracting a frequency band, single frequency, series of harmonics or noise to a discrete layer, you can invert the layer’s phase and combine it with the layer for the original (in-phase) audio clip. To extract noise, paint with your mouse where only noise occurs and then apply the Extract/Noise tool across the entire time and frequency ranges of the clip. You can also extract a single frequency and, optionally, all of its harmonics to a discrete layer this is how you’d extract a single bass-guitar note from a full mix. The original clip remains intact in its layer. You can create another (empty) layer, make it active and use editing tools to transfer (extract, in SLP parlance) a band- and time-limited snippet of content from the full clip to it. When you import an audio clip into SLP, it appears in a new layer. The stand-alone program (not available as a plug-in) shows your imported audio in an auto-scrolling spectrogram having time (horizontal) and frequency (vertical) axes (see figure). Using an 8-core Mac Pro running OS X 10.8.2, I tested SpectraLayers Pro Version 1.0.21 in restoration, sound design and remastering applications. SpectraLayers Pro lets you extract in turn the various embedded elements of a mono or stereo audio file, transfer each component to a discrete layer (a track synced to the original audio) and process the layers independently to create an entirely new mix of the material. This zoomed view shows a 65Hz tone (red blotches) added to kick-drum hits in a previously archived master. SpectraLayers Pro displays and edits audio in a spectrogram.
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