10.6

671Logic Pro Instruments
• Warmth slider and field: Set the amount of random deviation from an equal-tempered
scale. High values add life to sounds. The Warmth parameter can be useful when
you are emulating an instrument that has not been tuned for a while, or for slightly
thickening a sound. When you are playing chords, the Warmth parameter creates a
slight detuning or beating effect between notes.
• Pitch Wheel slider and field: Determine the pitch bend range in semitone steps. Use
your keyboard pitch bend wheel to control pitch bends.
• Pitch Pressure slider and field: Adjust aftertouch sensitivity. On an original D6, applying
pressure to a depressed key raises the pitch slightly. Pitch Pressure emulates this
behavior. Values to the left of the center position lower the pitch slightly with aftertouch
messages. Values to the right raise pitch.
Stretch tuning in acoustic instruments
The tones of upright pianos, and to a lesser extent grand pianos (due to their longer
strings), have inharmonicities in their harmonic structure. This also applies to other
stringed instruments, but it particularly affects pianos due to the length, density, and
tension of the strings. If a piano is perfectly tuned to equal temperament across the
keyboard range, the overtones of the low strings and the fundamentals of the high strings
sound out of tune with each other.
To circumvent this problem, piano tuners use a technique known as stretch tuning, where
the high and low registers of the piano are tuned higher and lower, respectively. This
results in the harmonics of the low strings being in tune with the fundamental tones of the
upper strings. In essence, pianos are intentionally “out of tune” (from equal temperament),
so that the lower and upper registers sound in tune.
Because the original D6 is a stringed instrument, this inharmonic relationship also applies
to Vintage Clav and the instruments it emulates. The stretch feature, however, was
primarily included for situations where you want to use Vintage Clav alongside an acoustic
piano recording or performance.
Logic Pro Vintage Clav Misc parameters
The Misc(ellaneous) parameters affect the entire Vintage Clav instrument, rather than an
individual model.
MIDI controller assignments allow you to control Vintage Clav with an external MIDI
controller.