Hi Martin

I know many folk on here use the SD2 and it is well thought of.
It will give you a nice set of midi voices for sure, so if you want midi backing tracks for your guitar playing it could be good.
The Ketron unit works as an external mid synth in BIAB, and will send its sound as audio this will need to be fed to your sound card audio in, or audio interface in if you want to hear it on the pc.
Alternatively you could feed it to a spare clean channel on your guitar amp if you are using electric guitar.
Have fun
Mike


BIAB2021 UltraPlus,AsusN55S1Tbssd, W10/64,Akai EIEpro
Yamaha CVP405,SquireStrat, CoolsoftVMidSynth
Novatation Impulse61 Ctr kbd, Cwalk blab Kontakt

http://mikesmusic.byethost16.com/