1 files changed, 77 insertions, 0 deletions
diff --git a/stkdrone~/drone.cc b/stkdrone~/drone.cc
new file mode 100644
index 0000000..ba065ad
--- /dev/null
+++ b/stkdrone~/drone.cc
@@ -0,0 +1,77 @@
+ /******************************************/  
+/*  Karplus-Strong drone string model   */
+/*  by Perry Cook, 1995-96                */
+/*					  */
+/*  There exist at least two patents,     */
+/*  assigned to Stanford, bearing the     */
+/*  names of Karplus and/or Strong.       */
+/******************************************/
+
+#include "drone.h"
+
+drone :: drone(MY_FLOAT lowestFreq)
+{
+  length = (long) (SRATE / lowestFreq + 1);
+  loopGain = (MY_FLOAT) 0.999;
+  loopFilt = new OneZero();
+  delayLine = new DLineA(length);
+  envelope = new ADSR();
+  noise = new Noise;
+  envelope->setAllTimes(2.0,0.5,0.0,0.5);
+  this->clear();
+}
+
+drone :: ~drone()
+{
+  delete loopFilt;
+  delete delayLine;
+  delete envelope;
+  delete noise;
+}
+
+void drone :: clear()
+{
+  loopFilt->clear();
+  delayLine->clear();
+}
+
+void drone :: setFreq(MY_FLOAT frequency)
+{
+  MY_FLOAT delay;
+  delay = (SRATE / frequency);
+  delayLine->setDelay(delay - 0.5);
+  loopGain = (MY_FLOAT) 0.997 + (frequency * (MY_FLOAT)  0.000002);
+  if (loopGain>1.0) loopGain = (MY_FLOAT) 0.99999;
+}
+
+void drone :: pluck(MY_FLOAT amplitude)
+{
+  envelope->keyOn();
+}
+
+void drone :: noteOn(MY_FLOAT freq, MY_FLOAT amp)
+{
+  this->setFreq(freq);
+  this->pluck(amp);
+#if defined(_debug_)        
+  printf("drone : NoteOn: Freq=%lf Amp=%lf\n",freq,amp);
+#endif    
+}
+
+void drone :: noteOff(MY_FLOAT amp)
+{
+  loopGain = (MY_FLOAT) 1.0 - amp;
+#if defined(_debug_)        
+  printf("drone : NoteOff: Amp=%lf\n",amp);
+#endif    
+}
+
+MY_FLOAT drone :: tick()
+{
+  /* check this out */
+  /* here's the whole inner loop of the instrument!!  */
+  lastOutput = delayLine->tick(loopFilt->tick((delayLine->lastOut() * loopGain))
+		+ (0.005 * envelope->tick() * noise->tick())); 
+  return lastOutput;
+}
+