I need to apply an eight-pole Butterworth low-pass and later a high-pass 
filter.  Are there any built-in mechanisms for this?
If there are not, would someone mind providing some algorithmic guidance as to 
how this could  accomplished?  Why?  I am attempting to reproduce an experiment 
in which an eight-pole Butterworth filter was used -- a high-pass at 300Hz and 
a low-pass at 3000Hz. If it matters, this is not for iOS.

Thank you kindly,


W.
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