Emulator Composite.book - Creative

7 - Editing a Sample
Sample Edit Tools
The following table lists the algorithms for constant time pitch shift.
deep Predominant bass (to 20 Hz)
bass Predominant bass (to 20 Hz)
mid-1 Average source material
mid-2 Average source material (high-mids)
high Source material with high frequencies
tight Maintains time accuracy - Drum loops
broad Low bass energy but critical highs
broad-smooth Both high & low freq. - Smooth output
difficult Inharmonic or broadband material
noisy Non-pitched - Sound Effects, etc.
tight-smooth Rhythmic accuracy - Use small ratios
x-smooth Rhythmic accuracy - Use small ratios
Transform Multiply
This powerful synthesis tool multiplies two signals together in a way that the output
signal contains the timbral and time elements of both inputs. This process, which is
also known as Convolution, reinforces frequencies common to both sources and
discards frequencies not present in both sources. Because of this characteristic,
Transform Multiplication works best with sounds that are harmonically rich.
Convolution has recently become popular as a way to model natural sounding reverberation
from an actual room. You can experiment with this yourself by recording an
impulse response in a reverberant space and then Transform Multiplying it with a
sound of your choice. To create a simple impulse response, record a starter pistol or
sharp percussive noise burst in your favorite room. If you’re interested in this subject,
you’ll find information about convolution and free impulse responses on the Internet.
To use Transform Multiply, just copy a sample region to the clipboard, then choose
another sample and Multiply!
Ideas for Using Transform Multiplication
• Reverb impulse responses will add their reverb signature to any sample.
• Percussion transients make good source material.
• A stereo impulse response can be T.M.’ed with a mono source to create a stereo
output.
• Apply pitch shift or time compression to room impulse responses to change the
resonance and decay time of the result.
• Reversing the impulse (clipboard sample) will reverse the attacks of transients in
the main sample.
• Make your own impulses. Select a sample region, fade it, then copy to the
clipboard and Transform Multiply
• Using speech as one of the sources, it is possible to “speak from within” another
instrument (violins, bassoons, cymbals, etc.).
• Splicing silence to the beginning or ending of sounds will change the spectral
characteristics of the result.
The output of any
filter is the convolution of
its input signal with its
impulse response.
176 Emulator X2 Operation Manual