Thank you!!! I believe I'll be investing in some purple ones. I think I've possibly screwed these red ones, judging by what edlyle's said. Live and learn, eh? I did read something about the changing modes, but apparently the newer ones don't switch between modes, according to my reading. They're just RMS. When I hold down the left button, no mode changing.
That's a good thing; the mean mode was just because whoever was programing the chip knew computer programming but didn't know electronics; afterwards when they discovered that the numbers were wrong, they added on an rms mode and called the existing mode the mean mode.
On my vamos, sometimes when I make power changes as in changing from 7.5volts input to 4 volt input my vamos might reset to factory default, which puts them in mean mode. You won't have that problem.