Poo, it sounds like poo. Family forum and all that like the kids never hear that....

Anyway, that's why I asked about what you're using for midi sounds. Midi is not Real Tracks. Those are audio and sound great but midi is completely dependent on the quality of your midi synth and Biab includes the VSC Dxi which is decent or cheesy depending on your taste in sound. You can spend around $400 or so for the Ketron SD2 that sounds pretty close to the RT's so that choice is yours.
The reason for a good preamp is to boost the power of your mic's signal plus the preamp itself will greatly increase the sound quality, again depending on how much you spend and the mic you're using. If you think it sounds pretty decent right now, then good, no need for a preamp but I think you would like the better sound. A decent mixer already has pre's built in or you can buy a separate pre and just like the midi synths, the sky's the limit price wise there too. Anywhere from under $100 to thousands.

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.