I’m not sure this would ever be possible when you look at the structure of the S2400 and the DSP card. As far as I can tell there are 4 major components to the S2400:
Top panel is the controls (all the physical buttons and faders), bottom panel is the main board / where the original audio engine takes place, then you have the analog outputs and the power supply. (I’m sure there’s more to it but I’m simplifying it here).
If you recall what you did when you installed the DSP card you disconnected the analog outputs from the main board, disconnected the Control interface which was the big ribbon cable on the side and disconnected the analog audio outputs which were the smaller thin and long cables.
Your then plugged the analog audio output cable from the mainboard into DSP card and then new analog output cables to the physical analog outputs.
So effectively the DSP card is sort of an external effects unit that exists after the main board. When you do a Bounce Pattern / Sound action, that action exists on the mainboard. And as far as I can tell the DSP card isn’t routing any audio back to the mainboard internally. The row of pins that you had to seat the DSP card onto are there to make sure the DSP card interfaces with the mainboard but actual audio is being passed through analog cables.
If you recall before you got the DSP card: you were never able to bounce the analog filters to a pattern either because again: they exist outside of the internal engine of the S2400.
I’d love to be wrong about it but this is how I understand the flow of the DSP card happening and I believe the only real way to record FX is the live looper with analog cables going from the output to input. It’s not a big deal to set up especially if you have a template project that already has the looper set up how you want it.