refactor: oscillator "process" method name

src/Oscillator.cpp

@@ -45,7 +45,7 @@ void Oscillator::SetFreq(float freq) {
     m_phase_dt = (this->*m_dt_function)(freq);
 }
 
-float Oscillator::GenerateSample() {
+float Oscillator::Process() {
     return (this->*m_osc_function)() * m_volume;
 }
 

src/Synth.cpp

@@ -71,7 +71,7 @@ void Synth::Trigger(Note input) {
 }
 
 void Synth::apply_filter_lfo() {
-    float dt = m_lfo->GenerateSample();
+    float dt = m_lfo->Process();
     Filter* filter = (Filter*)m_effects[1];
     float freq = filter->GetFreq();
     //todo: check formula