Maximum width is 540 pixels for a web page, and 395 for an e-mail sig.
Height, width, gain, left and rightoffsets, and music will all make your scope react differently. Play around with different values to create the look you desire.
The Mad Rabbit Audioscope Builder is a great tool that let's you customize your audioscope by just changing a few values. It's a great place to familiarize yourself with all the audioscope attributes with just the click of a button. Each code is displayed for you to copy and paste--what could be easier?