Hi F5D and Welcome to PlanetZ,
If I understand the question correct what you want to do is pipe in an outboard synth to SFP (the scope mixer) and record the audio into Cubase?
Simple as could be! The 1st thing you want to do is when thinking about Scope, is it all works the same as hardware, so in a sense the Scope mixer could be deemed an outboard desk, but heres the beatuty of it all
There are virtual routings that are done via ASIO and can be routed into Cubase and Cubase routed back into the mixer for seamless integration with your sequencer software, it gets so much deeper than just that but its impossible to explain what the Scope system can do, you need to realize it in person to be blown away..
What you would basically do is have the Scope mixer set up in the routing window and providing you have your ADDA connected via litepipe you would place an ADAT module in the routing window and then connect the virtual cables as if it were real hardware, and then the input of your adat channels will be playing into the scope mixer.
Now from the scope mixer you place an ASIO destination (this is the output into cubase) and how ever many output channels you have set up, cubase will automatically read these and show them as real input/outputs, its genious really.
So from there on the audio track you wish to write the synth line, you would simple set the input of that track to the coresponding scope channel that will be listed in SX.
Whats genious about all this is that this is done in realtime, zero latency, so from within SX you hear it played as it sounds and is recorded likewise.
Asfar as adding FX, theres a few ways to accomplish this but for now lets assume you are doing things the simple way, here are a couple examples.
1. You would open your mixer, select the track that the outboard is piped into via litepipe and place a send right into the channel, similar to SX or if you wish to conserve DSP you could add it as an aux send and have a few effects that can be used on all channels, the amazing part about this is that you here the effects in realtime, as far as I know CW cards are the ONLY cards able to effect audio coming in, where as most cards only effect audio coming out..
2. The other way would be similar to how you would typically work in SX. You could write the audio to a track in SX and then from the track info set the output of that particular audio track to a desired CW output, then the audio track is now routed directly into the scope mixer on its own channel and again you could apply effects in the same manner either as a direct insert or as a send.
The amazing thing is that there is no set way to do anything in Scope, you coukd rout anything anyway that you see possible, if it can be done in the real world it can be done with a Scope system, and the best part is the sound quality is top notch, all the effects, synths, mixers, EQs and most important all the free and purchasable 3rd party devices make it more than worth while to venture into the platform.
Hope that helps some, feel free to ask questions every one here at the Z is usually extremely helpfull from general questions to tweaking questions, the Z is sort of like a home support group for all the addicted folks.
Cheers!
Sir