Hi There Chris
We are Siglent Distributors but new to them as we've always carried Rigol products. I saw your question and asked Siglent for you. Please see response below:
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The Siglent SSA3X Plus, SSA3000X-R, SVA1X, SHA850A, SSA5A can do MA option.
And hence GFSK as well but its extra option licence.
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I didn't see the second part of your question so didn't ask that. Have you tried going back to the company that sold the unit to you? They should answer these questions for you or atleast give you details of the application engineer at Siglent to help with this?
I hope that helps. Warm wishes for a fantastic Christmas!
Sincerely
Joy
Instruments 4 Engineers Ltd ( Located in the UK)
https://www.instruments4engineers.com/Authorized Rigol Distributors
Authorized Micsig Distributors
Authorized Siglent Distributor
And many more