It been many yrs since I touched one...
Think the fobs are on the system as a zone, delete it.
The radio stuff was documented its own manual,
You'd be best of with co. with expirance of the product or rip the whole thing out & replace
I recall building then up from-
ADE, Elmdene or Aritech Bell modules
Kinetic Siren
Kinetic Strobe
Sometime with
Dragon? Anti foam modules
or CQR Foam pendent
The 1st complete box I recall is CQR interga, 1st one we used was a CQR Cequra