dynamic string tuning

src/synth/Synth.cpp

@@ -6,6 +6,9 @@ Synth::Synth(ConfigService* config, LoggerService* logger, ScopeBuffer* scope, N
 
     voices_.fill(Voice(config_, logger_));
 
+    filter_.setSampleRate(44100.0f);
+    filter_.setParams(Filter::Type::BiquadLowpass, 1000.0f, 0.707f);
+
 }
 
 void Synth::handleNoteEvent(const NoteEvent& event) {
@@ -56,13 +59,13 @@ void Synth::process(float* out, size_t nFrames) {
         float mix = 0.0f;
         for(size_t j = 0; j < voices_.size(); j++) {
             bool temp = false;
-            //if(!voices_[j].isActive()) continue;
+            if(!voices_[j].isActive()) continue;
             mix += voices_[j].process(temp);
             if(j == lowestVoice) triggered = temp;
         }
         mix = tanh(mix/4.0f); // prevent clipping
 
-        sampleOut = mix;
+        sampleOut = filter_.biquadProcess(mix);
         out[2*i] = sampleOut;
         out[2*i+1] = sampleOut;
 
@@ -96,4 +99,4 @@ Voice* Synth::findVoiceByNote(uint8_t note) {
         }
     }
     return nullptr;
-}
+}