Thanks. I found the software option for the 800 series, it's another 95 € + tax.
Sounds like the SDG810 for € 169 is a better deal then, since it is standalone and includes the AWG functionally. Any downsides, i.e. is there a need to control the AWG functionally from the scope or can the scope even talk to the SDG?
Or for that matter, do I need a Siglent function generator at all to do Bode plots, i.e. could I set my Owon generator to do a sweep and let the Siglent trigger on the start of the sweep?
Bonus question: is there any good reason to by a 4-channel scope when all I do is analog (including Class D) audio? So far, I have never felt the need for more than two channels.