rh stereoBal, does not distinguish between positive and nega

It's a crap attempt at stereo balance control, I should make some changes to it.
Some time ago found the module needs proper pan law ( or a mode selector to choose a law ).

Are you talking about the volume pin?
It seems I didn't set a negative value block ( clip ), so that's wrong indeed.




float balance_left  = 1.0f + *pan;
float balance_right = 1.0f - *pan;

*leftOut = *inputL * *volume * balance_left * 0.5f;
*rightOut = *inputR * *volume * balance_right * 0.5f;


I won't say it is wrong, it's a design choice. In my pan module I clip the pan control, but not the volume level control, because sometimes you want the level at -10 instead of +10.


//some pan laws I use in my module - assumes pan is in 0-1 range --adapt to your own needs, designed to use sqrts as they are pretty cheap on modern CPUs

//equal power 3dB - most common
    float x = pan * (M_PI/2);
    float x2 = x*x;

 float taylorCos = 0.04166666666666666f*(x2*(x2-12.0f)+24.0f);//taylor approximation
 float taylorSin = 0.008333333333333333f*x*(x2*(x2-20.0f)+120.0f);//don't need full precision

outputL = (*input1*taylorCos);
outputR = (*input2*taylorSin);

//sqrt power - also 3dB, just different 'taper'

float sqrtT = sqrtf(1.f-pan);
float isqrtT = sqrtf(pan);

// 1.5dB power law - just for fun

float sqrtSqrt = sqrtf(sqrtf(1.f-pan));
float isqrtSqrt = sqrtf(sqrtf(pan));

// 4.5 law - used on some hardware and pro-tools

 float sqrt1 = sqrtf(pan);
 float sqrt1inv = sqrtf(1.f-pan);
 float sqrtT = sqrt1inv * sqrtf(sqrt1inv);
 float isqrtT = sqrt1 * sqrtf(sqrt1);



Cheers
Andrew