10.6

709Logic Pro Instruments
• Noise:white, pink and red, blue: Noise is useful for emulating percussive sounds, such
as snare drums, or wind and surf sounds. There are more noise wave colors than those
listed, but they are rarely found in synthesizers.
• White noise: The most common noise waveform found on synthesizers. White noise
contains all frequencies—at full level—around a center frequency.
• Pink and red noise: These noise colors also contain all frequencies, but they are not
at full level across the frequency spectrum. Pink noise decreases the level of higher
frequencies by 3dB per octave. Red noise decreases the level by 6dB per octave.
• Blue noise: Blue noise is inverse pink noise, and increases the level of all frequencies
in higher octaves by 3dB.
You can deform the basic waveforms to create new waveforms, which results in a different
timbre, or tonal color, thus expanding the palette of sounds you can create.
There are many ways to reshape a waveform, the most common of which is changing
the pulse width of a square wave. Other ways include changing the phase angle, moving
the start point of a waveform cycle, or combining multiple waveforms in multioscillator
synthesizers.
When waveforms are reshaped in these and other ways, the relationships between the
fundamental tone and other harmonics change, thus altering the frequency spectrum and
the basic sound being produced.