Ok, I do this all the time, so I'll tell you what I've figured out.

When you enter the time Warp dialog, arrow through the presets.  You 
want to find one that uses the similarity algorithm.  I double the 
speed, and I can't remember if the present called '200 per cent via 
similarity" was already there or if I created it.  similarity is a 
slow process, but seems to yield the best compression.  You can also 
use the fft process, but I think it's more suited to music.
Assuming you have an existing preset for 200 percent via similarity, 
if you want to double the speed, that's all you'll need to do.  You 
can tab to the preview button to see what the file will sound 
like.  As you tab through the dialog, you'll find a set of radio 
buttons to dictate whether you want to set the percentage of speed 
you want or the end length of the file you want to achieve.  I think 
it's easier to use the percentage.  There is an edit field to specify 
the speed, with 200 per cent being double and fifty per cent being 
half speed.  There are two values, Window Size, which should be set 
for 20, and Search Range, which should be set for 10.    If there are 
no presets for the Similarity algorithm, you set the algorithm with 
the left and right arrow keys on a tab control located between the 
percentage edit field and the window size edit field.

I hope you can piece it together from these admittedly fragmented 
instructions.  If not, let me know.

Dean


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