hi;
I'm surprised the 480 filters don't just plug in.  Unless there were space 
issues, seems like they took a step backwards.  I believe they plugged in 
the ts450.
I know you can rely on the dsp and manage without them but they are 
certainly nice extras.  Both the 500hz cw filter and maybe the 1.8 ssb while 
I'm filtering might not be bad things to have.
Richard