custom decay curve issue #1107

[quargsgreene]

1. Please make all pull requests on the dev branch.
2. Don't commit build files
3. Try to get all tests to pass.

[codecov[bot]]

Codecov Report

Merging #1126 (d463286) into dev (ae0033d) will decrease coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1126      +/-   ##
==========================================
- Coverage   98.43%   98.40%   -0.03%     
==========================================
  Files         184      184              
  Lines        7710     7709       -1     
  Branches      679      679              
==========================================
- Hits         7589     7586       -3     
- Misses         34       35       +1     
- Partials       87       88       +1     

Impacted Files	Coverage Δ
Tone/component/envelope/Envelope.ts	99.35% <100.00%> (-<0.01%)	:arrow_down:
Tone/event/PatternGenerator.ts	97.18% <0.00%> (-2.82%)	:arrow_down:

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[tambien]

This is great! thank you!