Offset and oscilloscopes?

[Mitchell Hudson]

    A friend of mine just loaned me an oscilloscope. Its very eye
opening to be able to look at the wave forms through the scope. It also
raised some questions.

    I am feeding some white noise through the offset on Tom G's VCA5b. I
am expecting that the noise wave form will stay the same shape but move
up or down realative to the center of my scores 0v. Instead the wave
just gets a little fuzzier.
    So Fed a triangle through the offset to see what it looked like. It
seems that the line on the scope looks kinda thicker when the triangle
is fed through the scope. As I turn up the offset the line gets thicker
and and fuzzier still while the peaks of the waveform come together and
transpose themselves when the offset is turned all the way up. Could
someone explain whats going on here?
    I can't take a picture of the wave but a made a little diagram to
describe what is happening at:

http://www.webdevils.com/schematics/question.jpg

Thanks

--M