Interpolation is by no means the only useful thing to do with
gesture bracketing. For one thing, perhaps minor, Pro Tools plugin
API has a way to highlight controls that are being controlled, so
the begin gesture would draw the highlight and the end gesture would
remove it. More importantly, Logic and other DAW software have
multiple automation recording modes, some of which erase old
automation data whenever the user modifies a parameter. Without the
begin gesture and end gesture, there would be no way for the
automation system to know that it should erase and update the
automation value for the duration that someone holds the mouse on a
control, or otherwise holds a control at some new value. Also, the
final release of the mouse may come a very long time after the last
value change, but the automation system must cease erasing old data
and revert to the old automation value as soon as the user "lets go"
of the control - i.e. end gesture.
Interpolation is completely optional and rather unrelated to gestures.
Brian Willoughby
Sound Consulting
On Jan 23, 2008, at 22:07, Stephan M. Bernsee wrote:
Am 24.01.2008 um 04:05 schrieb William Stewart:
On Jan 23, 2008, at 1:36 PM, Stephan M. Bernsee wrote:
Am 23.01.2008 um 22:24 schrieb Eric Gorouben:
No, I'm afraid not (not at the moment anyway). Except that you
should NOT bracket every parameter change by a begin/end gesture
event...!
But that wouldn't prevent the automation from working, it would
just cause the parameter values to jump instead of being
interpolated...
No - there's no implication from Begin/End gesture that there is
any interpolation... Setting a parameter is always going to be an
explicit "set the parameter to this value now" call. Its up to the
AU to dezipper the parameter change if it should be (that is, you
never want it to just jump internally because it would cause a
glitch or some such)...
Well, but of what use are the begin/end gesture events then, if not
to notify the host
that
any
AUParameterSet calls between them are to be interpreted as sampled
points along a continuous path?
--smb
