Yes, the downloadable installer includes a 30+ page electronic User's Guide in Adobe PDF format.
On the Macintosh, the manual will be installed in the Synthetic Aperture folder within the After Effects Plug-ins folder. On Windows, the manual will be available from the Start Menu under the Test Gear entry.
The User's Guide is in Adobe Acrobat (PDF) format. You'll need Acrobat Reader 8.0 or later to read the manual.
You can download the free Reader from the Adobe web site.
You have OpenGL support turned on in After Effects. This causes the intermediate frames to be processed entirely via OpenGL, not giving Test Gear a chance to read the pixels.
You can disable OpenGL within the After Effects Preferences. Choose the Previews page within the Preferences. Near the top, within the Fast Previews section, there is an "Enable OpenGL" checkbox. Make sure that box is unchecked and click OK.
Enabling OpenGL actually makes very little difference in preview speed within After Effects except for a few specific 3D cases—at least as of CS5—so you are unlikely to notice any difference in performance after you've disabled OpenGL.
This issue has been resolved in Test Gear 1.0.3. After updating Test Gear, delete the After Effects preferences. The problem should now be eliminated.
If you do not want to delete all of your After Effects preferences, and are comfortable editing the preferences text file, you can delete only the "Pref_SOUND_PREVIEW_DEPTH" line in the "Main Pref Section". This will reset the problematic setting and RAM previews should once again function properly.