add sample preview volume setting

it was too loud

src/engine/engine.cpp

@@ -3246,6 +3246,10 @@ void DivEngine::setMetronomeVol(float vol) {
   metroVol=vol;
 }
 
+void DivEngine::setSamplePreviewVol(float vol) {
+  previewVol=vol;
+}
+
 void DivEngine::setConsoleMode(bool enable) {
   consoleMode=enable;
 }
@@ -3450,6 +3454,7 @@ bool DivEngine::initAudioBackend() {
   clampSamples=getConfInt("clampSamples",0);
   lowLatency=getConfInt("lowLatency",0);
   metroVol=(float)(getConfInt("metroVol",100))/100.0f;
+  previewVol=(float)(getConfInt("sampleVol",50))/100.0f;
   midiOutClock=getConfInt("midiOutClock",0);
   midiOutTime=getConfInt("midiOutTime",0);
   midiOutTimeRate=getConfInt("midiOutTimeRate",0);
@@ -3457,6 +3462,8 @@ bool DivEngine::initAudioBackend() {
   midiOutMode=getConfInt("midiOutMode",DIV_MIDI_MODE_NOTE);
   if (metroVol<0.0f) metroVol=0.0f;
   if (metroVol>2.0f) metroVol=2.0f;
+  if (previewVol<0.0f) previewVol=0.0f;
+  if (previewVol>1.0f) previewVol=1.0f;
   renderPoolThreads=getConfInt("renderPoolThreads",0);
 
   if (lowLatency) logI("using low latency mode.");

src/engine/engine.h

@@ -490,6 +490,7 @@ class DivEngine {
   float metroFreq, metroPos;
   float metroAmp;
   float metroVol;
+  float previewVol;
 
   size_t totalProcessed;
 
@@ -729,6 +730,9 @@ class DivEngine {
     int getSamplePreviewPos();
     double getSamplePreviewRate();
 
+    // set sample preview volume (1.0 = 100%)
+    void setSamplePreviewVol(float vol);
+
     // trigger sample preview
     void previewSample(int sample, int note=-1, int pStart=-1, int pEnd=-1);
     void stopSamplePreview();
@@ -1282,6 +1286,7 @@ class DivEngine {
       metroPos(0),
       metroAmp(0.0f),
       metroVol(1.0f),
+      previewVol(1.0f),
       totalProcessed(0),
       renderPoolThreads(0),
       renderPool(NULL),

src/engine/playback.cpp

@@ -2202,7 +2202,7 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
       } else if (srcPortSet==0xffd) {
         // sample preview
         for (size_t j=0; j<size; j++) {
-          out[destSubPort][j]+=samp_bbOut[j]/32768.0;
+          out[destSubPort][j]+=previewVol*(samp_bbOut[j]/32768.0);
         }
       } else if (srcPortSet==0xffe && playing && !halted) {
         // metronome

src/gui/gui.h

@@ -1503,6 +1503,7 @@ class FurnaceGUI {
     int separateFMColors;
     int insEditColorize;
     int metroVol;
+    int sampleVol;
     int pushNibble;
     int scrollChangesOrder;
     int oplStandardWaveNames;
@@ -1683,6 +1684,7 @@ class FurnaceGUI {
       separateFMColors(0),
       insEditColorize(0),
       metroVol(100),
+      sampleVol(50),
       pushNibble(0),
       scrollChangesOrder(0),
       oplStandardWaveNames(0),

src/gui/settings.cpp

@@ -967,7 +967,7 @@ void FurnaceGUI::drawSettings() {
         // SUBSECTION METRONOME
         CONFIG_SUBSECTION("Metronome");
         ImGui::AlignTextToFramePadding();
-        ImGui::Text("Metronome volume");
+        ImGui::Text("Volume");
         ImGui::SameLine();
         if (ImGui::SliderInt("##MetroVol",&settings.metroVol,0,200,"%d%%")) {
           if (settings.metroVol<0) settings.metroVol=0;
@@ -975,6 +975,17 @@ void FurnaceGUI::drawSettings() {
           e->setMetronomeVol(((float)settings.metroVol)/100.0f);
         }
 
+        // SUBSECTION SAMPLE PREVIEW
+        CONFIG_SUBSECTION("Sample preview");
+        ImGui::AlignTextToFramePadding();
+        ImGui::Text("Volume");
+        ImGui::SameLine();
+        if (ImGui::SliderInt("##SampleVol",&settings.sampleVol,0,100,"%d%%")) {
+          if (settings.sampleVol<0) settings.sampleVol=0;
+          if (settings.sampleVol>100) settings.sampleVol=100;
+          e->setSamplePreviewVol(((float)settings.sampleVol)/100.0f);
+        }
+
         END_SECTION;
       }
       CONFIG_SECTION("MIDI") {
@@ -3246,6 +3257,7 @@ void FurnaceGUI::syncSettings() {
   settings.separateFMColors=e->getConfInt("separateFMColors",0);
   settings.insEditColorize=e->getConfInt("insEditColorize",0);
   settings.metroVol=e->getConfInt("metroVol",100);
+  settings.sampleVol=e->getConfInt("sampleVol",50);
   settings.pushNibble=e->getConfInt("pushNibble",0);
   settings.scrollChangesOrder=e->getConfInt("scrollChangesOrder",0);
   settings.oplStandardWaveNames=e->getConfInt("oplStandardWaveNames",0);
@@ -3407,6 +3419,7 @@ void FurnaceGUI::syncSettings() {
   clampSetting(settings.separateFMColors,0,1);
   clampSetting(settings.insEditColorize,0,1);
   clampSetting(settings.metroVol,0,200);
+  clampSetting(settings.sampleVol,0,100);
   clampSetting(settings.pushNibble,0,1);
   clampSetting(settings.scrollChangesOrder,0,2);
   clampSetting(settings.oplStandardWaveNames,0,1);
@@ -3535,6 +3548,7 @@ void FurnaceGUI::syncSettings() {
 
   e->setMidiDirect(midiMap.directChannel);
   e->setMetronomeVol(((float)settings.metroVol)/100.0f);
+  e->setSamplePreviewVol(((float)settings.sampleVol)/100.0f);
 }
 
 void FurnaceGUI::commitSettings() {
@@ -3656,6 +3670,7 @@ void FurnaceGUI::commitSettings() {
   e->setConf("separateFMColors",settings.separateFMColors);
   e->setConf("insEditColorize",settings.insEditColorize);
   e->setConf("metroVol",settings.metroVol);
+  e->setConf("sampleVol",settings.sampleVol);
   e->setConf("pushNibble",settings.pushNibble);
   e->setConf("scrollChangesOrder",settings.scrollChangesOrder);
   e->setConf("oplStandardWaveNames",settings.oplStandardWaveNames);