Ahhhh I figured it out!
The correct syntax is "visuname=!attachanalyser". It's kinda misleading because it creates and destroys the process whether you spell it correctly or not. Yay.
From what I see, they're one and the same. The filename is "vis_satan.dll", but it shows up in Winamp as "Sexy Attached Analyzer". The process in Winspector Spy is "attachanalyser".