snex custom interaction help?

[giftlift]

I can't figure out how to get the script to interact with the knob that "set" creates.
Ive tried to create "const float Gain = 0" at the beginning but the value doesn't update.
Also tried Gain.newValue()? IDK what I'm doing?
I don't know how to pass Gain to the processFrame function?

void prepare(double sampleRate, int blockSize, int numChannels)
{
	
}

float setGain(double newValue)
{
    return newValue;
}

void processFrame(block frame)
{
    frame[0]=frame[0]*Gain;
}

[Christoph Hart]

You need to declare a variable outside the function and set its value. Also the return type of a setX function has to be void. You are just returning the value which doesn't do anything.

float gain = 1.0f;

void setGain(double newValue)
{
    gain = (float)newValue;
}

void processFrame(block frame)
{
    frame[0]=frame[0]*gain;
}

[giftlift]

@Christoph-Hart thank you