haha, nevermind... I opened it up in "Effect Controls"... Duh
Expand the height of your audio track in the timeline panel. In the track header area, hover over the division between tracks, and you'll get a cursor with up and down arrows. Click and drag to increase or decrease the track height; that will give you more "space" to adjust the keyframes.
Additionally, if you're using clip audio keyframes instead of track audio keyframes, you can use the effects control panel to more finitely adjust the levels at a particular keyframe. Navigate to the keyframe you want to adjust, and then either type in a new value or hold down the Control key and drag the hot text to adjust in small increments.
I opened it up in "Effect Controls"... Duh
Glad that you found it. That little Slider is great, and for more critical work you can scrub the numerical entry, or click-type into it. At least four ways to adjust Keyframes, and three right there in Effects Control Panel.