Comment 17 for bug 1810495

@daschuer: Sorry, but it took me some time to get back to this. Mixxx is a little extreme to build, as I can't separate building from testing the application. Scons rebuilds everything in every target :(

Anyways, same problem with whatever was proposed in #11:

```
[----------] 1 test from AudioTaperPotTest
[ RUN ] AudioTaperPotTest.ScaleTest
src/test/audiotaperpot_test.cpp:44: Failure
Value of: catpb.parameterToValue(1)
  Actual: 1.99526
Expected: db2ratio(maxDB)
Which is: 1.99526
[ FAILED ] AudioTaperPotTest.ScaleTest (1 ms)
[----------] 1 test from AudioTaperPotTest (1 ms total)
```

Also, our reproducible build pipeline has the same issue as initially reported:
https://tests.reproducible-builds.org/archlinux/community/mixxx/build1.log