So with the help of ChatGPT I did the following changes:
;===== mech mode fast check============================
; G1 X128 Y128 Z10 F20000
; M400 P200
; M970.3 Q1 A7 B30 C80 H15 K0
; M974 Q1 S2 P0
; G1 X128 Y128 Z10 F20000
; M400 P200
; M970.3 Q0 A7 B30 C90 Q0 H15 K0
; M974 Q0 S2 P0
M975 S1 ; Enable previously stored resonance compensation
G1 F30000
G1 X230 Y15
G28 X ; re-home XY
;===== fmech mode fast check============================
(You edit the printer and go into Machine G-code | Machine start G-code. Copy it into a proper editor for better editing experience)
The four last command are important to keep.
This worked and my printer works absolutely fine so far. They probably have added that because it’s the standard configuration to put the AMS on top and this definitively affects the input shaping if you add/remove spools. Would explain the reports that you should not put a drawer or something below the AMS if you put it on top of the printer (reports of messed up quality).
I am not affected though, because my AMS is behind the printer due to how my enclosure (originally for the SV06+) is set up and the printer is on its own sitting on a concrete slab on foam.