At first, I was going to recommend the AudioBox USB 96, but after further thought, I think you need a higher capacity AudioBox, like the Studio 68. I use the AudioBox 44VSL, so I know the driver works. The Alesis isn't going to take you to the promised land.

The easy stuff:

1) Keep Windows audio on your internal (Dell) audio (RealTek?).

2) Configure BiaB to use the AudioBox (or other audio interface) ASIO driver.

Now for the tricky part...your digital piano.

I'm assuming that you're using the stereo Line Outs (L/R) directly into your Yamaha monitors, so you'll need an i/f that can handle 2 Line Inputs. After that, there are a lot of different ways to go. I'd be happy to do offer some one-on-one advice via email (before posting here whatever you finally wind up selecting). PM me if interested (click on my forum name).

Last edited by TheMaartian; 12/10/19 06:04 AM.
ThinkPad i9 32GB RAM 7TB SSD; Win11 Pro; RME Fireface UCX II; BiaB 2025 Ultra
Bitwig Studio 5; Studio One Pro 7; Melodyne Studio 5; Acoustica Premium 7
Gig Performer 5; NI S61 MK3; Focal Shape 65; Beyerdynamic DT 880 & 770