Piano-roll scroll bug fixed. Added record-with-accompaniment demo

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1007 0778d3d1-df1d-0410-868b-ea421aaaa00d

include/piano_roll.h

@@ -107,6 +107,7 @@ protected:
 protected slots:
 	void play( void );
 	void record( void );
+	void recordAccompany( void );
 	void stop( void );
 
 	void recordNote( const note & _n );
@@ -182,6 +183,7 @@ private:
 
 	toolButton * m_playButton;
 	toolButton * m_recordButton;
+	toolButton * m_recordAccompanyButton;
 	toolButton * m_stopButton;
 
 	toolButton * m_drawButton;