MACKIE Pro Audio Lab - Manual (Page 26)

User’s Guide
The A440 Tuning Reference
A440 Tuning Reference
Level
Use your mouse to select an output level ranging from off to 0 dB.
Reference Tone
The A440 is the accepted standard tuning reference. It’s handy to have access to this
reference tone to quickly compare an instrument tuning to an A440 reference.
Wave Select
This offers two separate waveforms that can be used as the tuning source tone. The
squiggly line is a sine wave with three harmonics, and the sine wave symbol is a pure
sine wave tone.
Cents
A frequency range can be fi ne-tuned to zero on a reference tone by adjusting from
415 Hz (100 cents) to 462 Hz (+100 cents).
( Note: A cent is a unit of a pitch interval equivalent to 1/100th of the semi-tone.)
Start
Left-click to start the tuning reference, press it again to stop. Right-click to play a
momentary tone burst for as long as you hold down the button.
Level Start Sine Cents
Sine with
Harmonics
Reference
Tone