Invalid Audio Volume

I've encountered yet another glitch in Pro Tools 6.4. And, I also know how to fix it.

I began an afternoon session as usual. I turned on my computer and external devices. Then, when attempting to start a new session, my Glyph drive appeared to have some problems. I received an error message: invalid audio volume.

I had no idea what that meant. When in doubt, call tech support. I did. They were great. Here's what happened.

When I was turning on my computer, I turned on my Glyph drive after the boot process had begun. This is a no-no. Always turn on all external hardware before loading the main computer. What happened was, in executing the improper sequence, I switched the drive function from "record" to "transfer." Hence, it was an invalid audio volume. Mac's are persnickety.

We fixed this by simply opening the Task Window in the Pro Tools tool bar. There it was, plain as day, set to "Transfer." I switched the "T" to "R" and everything worked fine.