Start working on PostGain

[iver56]

171

[codecov[bot]]

Codecov Report

Patch coverage: 91.30% and project coverage change: -0.15 :warning:

Comparison is base (3d3332c) 96.73% compared to head (9569bc6) 96.59%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #255 +/- ## ========================================== - Coverage 96.73% 96.59% -0.15% ========================================== Files 43 44 +1 Lines 1717 1763 +46 ========================================== + Hits 1661 1703 +42 - Misses 56 60 +4 ``` | [Impacted Files](https://codecov.io/gh/iver56/audiomentations/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Iver+Jordal) | Coverage Δ | | |---|---|---| | [audiomentations/core/post\_gain.py](https://codecov.io/gh/iver56/audiomentations/pull/255?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Iver+Jordal#diff-YXVkaW9tZW50YXRpb25zL2NvcmUvcG9zdF9nYWluLnB5) | `91.30% <91.30%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Iver+Jordal). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Iver+Jordal)

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