Hello to the ROLI team !
There is an issue in the SimpleFFTExample project source code. In the function "drawNextLineOfSpectrogram()", there is the following instruction :
const float skewedProportionY = 1.0f - std::exp (std::log (y / (float) imageHeight) * 0.2f);
I think it should be something like this instead :
const float skewedProportionY = (y == 0 ? 1.0f : 1.0f - std::exp (std::log (y / (float) imageHeight) * 0.2f));