I just looked at the Sonic Cell specs and it should work with a MIDI guitar controller. If you could give some more specs on how you are using it maybe I can help you get it up and running. It is important to know exactly how you are connecting everything, such as where are you plugging in your controller, DAW, BiaB or directly into Sonic Cell? How is Sonic Cell connected to your computer? Things like that are very helpful.

Which Sampletank are you thinking about, the free 32 bit version that is the version that is shipped with BiaB or the 64 bit new Version 3. If you are thinking about version 3 then instead of buying it I would get Kontakt. IMHO Kontakt is a much better purchase, sound wise and patch wise as there are many third party companies making patches for it. You might want to look into the free Kontakt Player as a starting point.

Just remember that these softsynths are not GM so you have to select what sound you want for each MIDI track, i.e. it is not automatic like GM.

PS-if you get a 64 bit soft synth you will need to buy jBridge to get them to work in 32 bit programs like BiaB and RB.

Whenever I get something stuck in the back of my throat, I dislodge it by drinking a beer.
It's called the Heineken Maneuver.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware