Dear Friends   In my Doctoral Dissertation, I converted every FORTE number in a modulo 12 Rhythm via time-point-system. There is a complete catalog included (see the link below). It's in portuguese.   After Janusz adjusted the Forte numbers to have the inversion, using "a" and "b" to differentiate the  prime forms from the inversions, it was easy to convert using codes like this: (setf ch0 (time-point-system (pcs '5-11b :pitch)'s :start 0)) (setf ch1 (time-point