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IBXM: Add stereo separation param for mod music

--- a/src/support/ibxm.c

+++ b/src/support/ibxm.c

@@ -8,6 +8,8 @@

 static const int FP_SHIFT = 15, FP_ONE = 32768, FP_MASK = 32767;

+static const int MOD_STEREO_SEPARATION = 50;  // ibxm default was 76.5

+

 static const int exp2_table[] = {

         32768, 32946, 33125, 33305, 33486, 33667, 33850, 34034,

         34219, 34405, 34591, 34779, 34968, 35158, 35349, 35541,

@@ -747,9 +749,9 @@

             return NULL;

         }

         for( idx = 0; idx < module->num_channels; idx++ ) {

-            module->default_panning[ idx ] = 51;

+            module->default_panning[ idx ] = 128 - MOD_STEREO_SEPARATION / 2;

             if( ( idx & 3 ) == 1 || ( idx & 3 ) == 2 ) {

-                module->default_panning[ idx ] = 204;

+                module->default_panning[ idx ] = 128 + MOD_STEREO_SEPARATION / 2;

             }

         }

         module_data_idx = 1084;