Adds an msf to the receiver.
Original signature is '- (DRMSF*) msfByAdding:(DRMSF*)msf'


- msf (DRMSF)
- The msf to add to the receiver

A new DRMSF object totalling the sum of the reciever and msf

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)