Synthetic

[Leviset]

Ok I've had my HP-41CX for a while now and I'm venturing into areas I last used 30+ years ago.
My calculator came with 2 Extended Memory modules and I also have the Clonix-D module from Diego.
I keep trying to do the Synthetic (I think if someone was sat next to me I'd get it!) but come up across program lines like STO M or STO IND 17 and things like press the PM key?
I tried one bit where I stored DEL to Log key and tried to ASN + to LN key and then use USER keyboard. Storing + to LN gives an error, the other one worked.

Finally do I have the ability to write Machine Code with my configuration using say one of the extended memory modules?
Thanks
Dennis