Couple of thoughts.

Did you load the .PAT file as shown earlier?

Does your Roland have a setting for something like "performance mode" as opposed to "patch mode"? Set it to performance mode. At least, that is what I have to do on my Roland Fantom. Otherwise, it cannot act as a polyphonic synth; it only sounds like one thing at a time. Look in your manual for something like "Using the Roland as an external synth".

Your Roland supports GM2. Try that, as follows:

In BIAB, go to Options, MIDI/Audio Driver Setup. Make sure your Roland is your MIDI Output device. On the Synth/Sound Card pull-down, what do you have there? The RD700 is not a choice on my system; try Roland Sound Canvas. If that doesn't work, try General MIDI Instrument. On the GM2 pulldown, select choice 2, GM2. Make sure DXi is unchecked.

Now, back in BIAB, on the GM menu, try some different settings under Send MIDI Message. Try "Send General MIDI Mode On and BB Patches", and "Auto Send GM Mode on Startup",

Also, make sure you are NOT sending any Roland GS messages.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.