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Doesn't BIAB have some synth built in? You mention "buying the Forte DXi", is that necessary?



No, nothing is built in but PG does include a free copy of the Roland VSC DXi synth that is a separate install just to get you started but most of us are not satisfied with that. Biab is a software engine that controls your sound source, exactly what it controls is up to you. Right now you have it controlling your Ensoniq but it can control any one of many different software or hardware synths. No different than saying your pc keyboard "controls" Word. But, maybe you don't want to use Word, that's your choice and the full version of Word in not included with most PC's.
With all the new Real Tracks/Drums whether or not you need another synth has become somewhat cloudy. If you continually buy all those sets you may never have a need for a synth for Biab but most of use use both.
The VSC is somewhat better than your built in sound chip on your motherboard and a lot of us used it for years, it's not too bad and you may be happy with it. When you install it, note there are two versions, the regular VSC or the VSC DXi. You want the DXi one. There is an issue with the VSC working with Vista if you're using that but I think there is a workaround. If you need it, I think it's in the FAQ's or someone can help you. This is only one of may reasons I don't use Vista so I can't help there.
Most of us think Forte is a nice step up in sound quality for very little money but of course only you can determine that. You can download a fully functioning demo for 30 days and if you don't like it, don't buy it.
There are innumerable threads in these forums going into great detail about all the different ways to achieve better sound and people spend hundreds to thousands for pro quality sound for Biab.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.