Apple Logic Pro 8 - Manual (Page 653)

Chapter 30 Advanced Tempo Operations 653
Window
This parameter determines the time span (or window) that tap notes can be entered
(set in ticks, or 1/3840 note). Only taps made within this time window are used to
determine the tempo. Any taps outside it are ignored.
 The narrower the window, the more effectively Logic Pro will be able to withstand
the influence (on the tempo) of any taps that fall between the note values—set with
the Tap Step parameter.
 The larger the window is set, the easier it becomes to create drastic tempo changes.
 If you set the window parameter to 0, the tap window will disappear altogether, and
all taps will be accepted as tempo-determining information. Logic Pro will also come
to a halt, if taps are not generated.
Tempo Response
This parameter sets the sensitivity to tempo changes: the larger the value, the greater
the sensitivity. You should set this value to 4, for most situations. If you find that your
tap timing is imprecise, but want Logic Pro to play at a relatively constant tempo,
reduce this value to 2 or so.
Max. Tempo Change
Use this parameter to set the maximum tempo change possible per tap (in bpm). To
obtain the most regular, or even tempo curve, follow this rule: set the smallest possible
value (in other words, only as large as necessary).
Tap Count-In
This sets the number of taps used as a count-in. Logic Pro will start following the
tempo on the first tap after the count-in taps.
Smoothing
Switching on this function smooths out jumps in tempo, resulting from incoming taps
(which could prove useful when using Logic Pro live). You should switch it off, if you
want Logic Pro to follow your taps precisely and quickly.
Tempo Recording
The Tempo Recording function creates a tempo list that follows your taps, when in
record mode. This Option should normally be switched off.
Pre and Post
These are the ways your tap signals are displayed:
 Pre: Displays every incoming tap.
 Post: Displays every accepted tap that occurs within the time window (as defined by
the Window parameter), or close to, or on, a tap step.
The Pre/Post tap signals flash yellow if the taps are within the allowed range, and red if
they are out of range.