Guitar: Yikes. I was afraid of that. If migrating to A7 gets too painful, I'll definitely try that. Of course, there are obvious drawbacks to using an image in 3D space and aligning it to the screen--the alignment problem itself being one and another being slight image distortions that inevitably result from inevitably imperfect screen alignment. Thanks again for your expertise. You've saved me a lot of time banging my head against the computer trying to knock a non-existent solution out.