QMedia Matrix commands 
QM_ConcatMatrix(matrixRecA; matrixRecB):error  

matrixRecA  Array real  Matrix record A 

matrixRecB  Array real  Matrix record B 

error  Longint  Error result 
Concatenates two matrices, combining the transformations described by both matrices into a single matrix.
Parameters matrixRecA and matrixRecB specify the two matrix records. Both must be declared as 3 x 3 arrays of reals. Parameter matrixRecB also receives the concatenation of the two matrices.
Related commands
QM_SetIdentityMatrix  Sets the contents of a matrix record to the identity matrix. 
QM_TranslateMatrix  Adds a translation transformation to a matrix record. 
QM_ScaleMatrix  Adds a scaling transformation to a matrix record. 
QM_RotateMatrix  Adds a rotation transformation to a matrix record. 
QM_SkewMatrix  Adds a skew transformation to a matrix record. 
QM_SetTrackMatrix  Changes the track's transormation matrix. 
QM_GetTrackMatrix  Returns the track's transormation matrix. 