Sensible defaults for AKLowPassButterworthFilter
Tests for AKLowPassButterworthFilter
Sensible defaults for AKHighPassButterworthFilter
Test for AKHighPassButterworthFilter
Sensible defaults for AKBandPassButterworthFilter
Test for AKBandPassButterworthFilter
Sensible defaults for AKBandRejectButterworthFilter
Test for AKBandRejectButterworthFilter
Merge pull request #52 from narner/develop

Added more sensible defaults