eda_process: band, order, and frequency are hardcoded

[jdkent]

Thanks for making this awesome tool, I've recently found this and this will certainly make my life easier.

I have a request from my PI to do bandpass filtering, but with the current options this is unavailable.
I had a question about why band, order, and frequency were hard coded.
I can submit a pull request implementing this functionality if you are in support of adding this, or if you could provide a reason as to why this may be a bad idea (the hard coded numbers are necessary to be at those values) and I will try to communicate that to my PI.