Volume Slider/Parameter doesn't go above 0 dB

Audio Plugins
1

I’ve created a volume slider using the new lambda feature in NormalisableRange. However, when I set the endpoint to 12.0f, the slider only displays 0 and volume doesn’t go beyond 0 dB in host (Ableton/Reaper).

#define MIN_INFINITY_DB -96.0f
<--->
 NormalisableRange<float> decibelRange = NormalisableRange<float>(MIN_INFINITY_DB, 12.0f,
                                                                     [](float min, float end, float gain)  { return gain > 0.0f ? 20.0f * log10(gain) : min; },
                                                                     [](float min, float end, float dB)    { return dB > min ? std::pow(10.0f, dB * 0.05f) : 0.0; }
                                                                     ) ;
 addParameter (gainParam = new AudioParameterFloat("volume", "Volume" , decibelRange, -6.0f));

I use the exact same conversion from decibels to float before calling buffer.applyGain(…).

Where does it go wrong?

2

Figured it out:

NormalisableRange<float> decibelRange = NormalisableRange<float>(MIN_INFINITY_DB, 6.0f,
                                                                     [](float min, float end, float gain)   { return gain > 0.0f ? 20.0f * std::log10( gain * Decibels::decibelsToGain(end) ) : min; },
                                                                     [](float min, float end, float dB)		{ return dB > min ?  std::pow(10.0f, dB * 0.05f) / Decibels::decibelsToGain(end)  : 0.0; }
                                                                     ) ;