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diff --git a/nyqstk/include/Instrmnt.h b/nyqstk/include/Instrmnt.h
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+/***************************************************/
+/*! \class Instrmnt
+    \brief STK instrument abstract base class.
+
+    This class provides a common interface for
+    all STK instruments.
+
+    by Perry R. Cook and Gary P. Scavone, 1995 - 2005.
+*/
+/***************************************************/
+
+#ifndef STK_INSTRMNT_H
+#define STK_INSTRMNT_H
+
+#include "Stk.h"
+
+namespace Nyq
+{
+
+class Instrmnt : public Stk
+{
+ public:
+  //! Default constructor.
+  Instrmnt();
+
+  //! Class destructor.
+  virtual ~Instrmnt();
+
+  //! Start a note with the given frequency and amplitude.
+  virtual void noteOn(StkFloat frequency, StkFloat amplitude) = 0;
+
+  //! Stop a note with the given amplitude (speed of decay).
+  virtual void noteOff(StkFloat amplitude) = 0;
+
+  //! Set instrument parameters for a particular frequency.
+  virtual void setFrequency(StkFloat frequency);
+
+  //! Return the last output value.
+  StkFloat lastOut() const;
+
+  //! Return the last left output value.
+  StkFloat lastOutLeft() const;
+
+  //! Return the last right output value.
+  StkFloat lastOutRight() const;
+
+  //! Compute one sample and output.
+  StkFloat tick( void );
+
+  //! Fill a channel of the StkFrames object with computed outputs.
+  /*!
+    The \c channel argument should be zero or greater (the first
+    channel is specified by 0).  An StkError will be thrown if the \c
+    channel argument is equal to or greater than the number of
+    channels in the StkFrames object.
+  */
+  StkFrames& tick( StkFrames& frames, unsigned int channel = 0 );
+
+  //! Perform the control change specified by \e number and \e value (0.0 - 128.0).
+  virtual void controlChange(int number, StkFloat value);
+
+ protected:
+
+  // This abstract function must be implemented in all subclasses.
+  // It is used to get around a C++ problem with overloaded virtual
+  // functions.
+  virtual StkFloat computeSample( void ) = 0;
+
+  StkFloat lastOutput_;
+
+};
+
+} // namespace Nyq
+
+#endif