Fix CRevModel process function loop stride

src/viper/utils/CRevModel.cpp

@@ -120,7 +120,7 @@ void CRevModel::Mute() {
 }
 
 void CRevModel::ProcessReplace(float *bufL, float *bufR, uint32_t size) {
-    for (uint32_t idx = 0; idx < size; idx++) {
+    for (uint32_t idx = 0; idx < size * 2; idx += 2) {
         float outL = 0.0;
         float outR = 0.0;
         float input = (bufL[idx] + bufR[idx]) * this->gain;