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add getNumActiveVoices to poly

--- a/LEAF/Inc/leaf-midi.h

+++ b/LEAF/Inc/leaf-midi.h

@@ -108,6 +108,7 @@

     void    tPoly_tickPitchBend(tPoly* const);

     int     tPoly_getNumVoices(tPoly* const);

+    int     tPoly_getNumActiveVoices(tPoly* const);

     float   tPoly_getPitch(tPoly* const, uint8_t voice);

     int     tPoly_getKey(tPoly* const, uint8_t voice);

     int     tPoly_getVelocity(tPoly* const, uint8_t voice);

--- a/LEAF/Src/leaf-midi.c

+++ b/LEAF/Src/leaf-midi.c

@@ -303,6 +303,12 @@

     return poly->numVoices;

 }

+int tPoly_getNumActiveVoices(tPoly* const polyh)

+{

+    _tPoly* poly = *polyh;

+    return tStack_getSize(&poly->stack);

+}

+

 float tPoly_getPitch(tPoly* const polyh, uint8_t voice)

 {

     _tPoly* poly = *polyh;