Hi Peter,

To set the pre or post roll value, go to the Transport window and find the pre 
or post roll value and use Control-Option-space to click. Then enter the new 
value and press Enter. You must type the value on the numeric keypad and 
starting with the first number. In other words, if you want to enter two 
seconds, you must type a zero, then the decimal, then zero two. Unless you want 
smaller increments after the seconds, you can press Enter after having typed in 
the zero two. If you're entering bars and beats, you'd type the bar number 
first and then hit Enter. If you want a bar plus two beats as a pre-roll, you'd 
enter one, press the decimal to get to the next field then type two and then 
hit Enter. Remember that the decimal advances you to the next value field. Once 
you hit Enter, the value takes effect. To retype a value, click once more and 
enter the full value again, using decimal to advance to the subsequent fields 
if necessary.

Once you have both pre and post roll values entered, the shortcuts I mentioned 
earlier will work. Make sure you're in the Edit window while auditioning.
HTH,
Slau

On Mar 22, 2016, at 12:05 PM, Peter Bosher <[email protected]> wrote:

> Many thanks Slau, that's already helped a great deal for auditioning the 
> post-roll, but I've searched the menus for how to set the value of the 
> pre/post-roll and not found it.  At the moment, command-left, option-left and 
> command-option-left all do the same thing.  Is there a keystroke which will 
> definitely play just the pre-roll portion, stopping at the point where the 
> selection starts?
> 
> Best,
> 
> Peter
> 
> 
> On 22/03/2016 11:31, Slau Halatyn wrote:
>> Hi Peter,
>> 
>> If you have values other than zero set for the pre and post roll, you can 
>> audition the ranges with keyboard shortcuts. Option-Command-left arrow will 
>> play the beginning of the selection including a pre-roll and 
>> Option-Command-right arrow will play the end of the selection along with a 
>> post roll. It's possible to play the pre and post roll individually using 
>> combinations of Option or Command and either the left or right arrows. 
>> Experiment by making a selection and using various combinations of 
>> Option-left or right arrows and Command-left or right arrows. You'll see how 
>> it works.
>> HTH,
>> 
>> Slau
>> 
>> 
>> On Mar 22, 2016, at 6:20 AM, Peter Bosher <[email protected]> wrote:
>> 
>>> Hi All,
>>> 
>>> When making fine adjustments to a selection, I need to hear not only the 
>>> selection itself, but also the second or two beforehand, stopping at the 
>>> in-point.  This is what I mean by pre-roll, and in SoundForge for example, 
>>> you can do this with CTRL-shift-K.   In PT, I see that I can enable 
>>> pre/post-roll with command-K, but how do I actually audition the pre-roll 
>>> and the post-roll?
>>> 
>>> Best,
>>> 
>>> Peter
>>> 
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