It appears that Sforzando is a VSTi and RealBand requires a DXi.

DXi sound engines such as Coyote WT are registered with Windows during installation. Registration is how RealBand knows the utility exists and the location.

Sforzando does not register with Windows during installation so RealBand does not recognize the program.

Using RealBand 2019 build 3, I set an empty track to midi, clicked the track fx, selected the add VSTi option, navigated to Program Files\Plogue\sforzando\VST and selected the "sforzando VST_x86.dll" file and it loaded fine. You have to select the x86 file because RealBand remains a 32 bit program at this time.

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Jim Fogle - 2024 BiaB (1109) RB (Build 3) Ultra+ PAK
Cakewalk - Zoom MRS-8 recorder
Desktop: i7 Win 10 build 2004, 12GB ram 256GB SSD, 4 TB HDD
Laptop: i3 64bit Win 10 build 21H2, 8GB ram 500GB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home