Recording and routing questions

Trying to setup a few different video synths and have some question about routing and cables. I currently have a korg kaptivator and ipad going into a roland v4ex (channels 3 and 4, respectively). The ipad connection is not stable so maybe a problem with the adapter. Anyone tried connecting an iPad to the v4ex with hdmi? I also built the VSERPI with waaave pool and can include this as a the second channel. Channel 1 is for analog feedback. If I can get the ipad more stable, this is pretty good. But I was also interested in exploring the possibility of running everything from the roland v4ex into the VSERPI waaave pool and hopefully recording into it. I have a 32 gb sd card in the raspberry pi 3B where waaave pool is running from. Is it possible to record performances directly into the sd card? If not, what is the optimal way to record performances with this setup? Maybe I just need one camera capture adapter (bought an elgato cam link 4k but didn’t try this yet). I would like to have at least one webcam for the visuals but I understand that waaave pool can only run hdmi or from the camera, not both.

Hi @Sahasra, you can always capture the full output from the Roland with one of this. I use the RCA version of the device and works fine even capturing a two hours session. I also use it as a portable tiny preview screen. This way you wont’ collapse the RPi with processing and capturing at the same time.