DEV: apply FD taper to waveform modes to remove Gibbs' features

[ColmTalbot]

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[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.79%. Comparing base (661b04e) to head (919e219).
⚠️ Report is 6 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   90.80%   90.79%   -0.02%     
==========================================
  Files          12       12              
  Lines         620      630      +10     
==========================================
+ Hits          563      572       +9     
- Misses         57       58       +1     

Flag	Coverage Δ
python3.10	90.79% <100.00%> (-0.02%)	⬇️
python3.8	90.79% <100.00%> (-0.02%)	⬇️
python3.9	90.79% <100.00%> (-0.02%)	⬇️

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