Function equalPowerCrossfade

src/Morphader.cpp:9–12

// equal power crossfade, -1 <= p <= 1
template <typename T> inline T equalPowerCrossfade(T a, T b, const T p) {
    // return std::min(std::exp(4.f * p), 1.f) * b + std::min(std::exp(4.f * -p), 1.f) * a;
    return simd::fmin(exponentialBipolar80Pade_5_4(p + 1), 1.f) * b + simd::fmin(exponentialBipolar80Pade_5_4(1 - p), 1.f) * a;
}

// TExponentialSlewLimiter doesn't appear to work as is required for this application.
// I think it is due to the absence of the logic that stops the output rising / falling too quickly,