Hi All,

Bob McClure made the suggestion that more people use the WinQuake volume 
file option which provides a very convient way of combining up to three 
traces into one PSN file.

There are some limitations on the multiple trace option. /Only event 
files that have the same start time, sample count, sample rate and 
sensor type (displacement, velocity or accelerometer) can be added to 
the the same Event Window/.

With an initial file displayed, use the WinQuake File/Add menu to find 
and pick the additional files that may be added.  /Only files saved at 
the same time will show on the directory which is brought up by the Add 
menu/.

A volume file can also be made using filtered data so that both the 
original and filtered traces can be displayed on one screen.  The Add 
menu is no help here because the original and filtered files have been 
saved at different times.  Here is a method around this limitation which 
I previously posted in February of 2006:

Assume the goal is to filter a recording and display both the filtered 
and unfiltered trace in one window.

The steps in WinQuake:

1.   WinQuake opens with  files listed in the "Open" screen. Select the 
quake to be displayed and click on "Open File" button
2.  Perform the filter operation and save the filtered file with a new 
name.  This is done in the "File Save" menu by modifying the name in the 
"File Name" window.  Click the "OK" button.
3.  Close the window containing the filtered file.  That should put you 
back to the "Open" screen with the list of event files which now 
contains the filtered file.
4.  Select both the filtered and unfiltered files by using the shift key 
while selecting the second file.  Both files should be highlighted.   
Click the "Open File" button.
5.  You should now see the traces from both files in the main WinQuake 
window.  Click the "Save" button.
6.   In the "File Save" window, you will see both names in separate 
"File Name" windows.  Find the "Dataset Volume" check/button and click 
to place a check in the box   One of the file names will disappear, 
leaving only one file name.   Modify the name (if desired) and click the 
"OK" button.   Both files will be saved as a volume with the modified name.
7.  Here is a link to the volume that I made as I typed these 
instructions.  
http://www.seismicnet.com/quakes/0602/060211.114712.ebgztwo.psn
Once opened, you can look at either individual file  by clicking the 
"View" button.  The drop-down menu choice "Display Record" or "Select 
Record" both give drop-down menu choices to examine the traces 
individually.

My thanks to Bob who helped and inspired me to learn how to use this new 
WinQuake feature.  Thanks also to Larry Cochrane who wrote WinQuake with 
all its useful features.

Roger


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