Limit value range with expression?

Hi there,

Is there a way to put a limit on value range when linking it to key-framed audio?

My situation is that I want to link the Glow Intensity of one of my objects to the key-framed audio. The issue I'm having is that everything north of 0.4 looks horrific.

So was wondering if there was anything I could add to the expression that will only allow the value of the Glow Intensity to vary between 0.0 and 0.4?

Cheers

Simon