I suggest you take a look at Gig Performer. They have a 14-day free trial of the Pro version available. I've been using GP since v1. The current version is v5, with v6 coming soon. A lot of excellent professional musicians use it live. The developers are former IBM Research engineers and also touring musicians. There's nothing else that comes close to it.

Just brainstorming, but if you replace your Focusrite Solo with a 4th gen 4i4 or 16i16 (which I think would work a little better for you), you could also eliminate your mixer and the MIDI module. Use the MIDI output of the 16i16 MIDI i/o to your SD-50. Route the SD-50 audio out to 16i16 analog inputs 3 & 4. Route the keyboard audio outputs to 16i16 analog inputs 5 & 6. If you choose a 4i4 instead, you'd have to use the front panel inputs 1 & 2 instead of inputs 5 & 6 located on the rear of the 16i16.

I am assuming that you've saved your BiaB backing tracks to stereo audio files and that you trigger the SD-50 and the appropriate audio file from your laptop. You can do all of the mixing, EQ'ing, clip playing etc. inside of GP and connect your Bose L1 powered speakers to the 4i4/16i16 main outputs (1 & 2).

Gig Performer Pro

Videos of artists who use Gig Performer

Focusrite Scarlett 4th gen 4i4

Focusrite Scarlett 4th gen 16i16

ThinkPad i9 32GB RAM 7TB SSD; Win11 Pro; RME Fireface UCX II; BiaB 2026 Ultra
Studio Pro 8; Tonalic Studio 1; Reaper v7; Bitwig Studio 6; Melodyne Studio 5
Gig Performer 5; NI S61 MK3; Focal Shape 65; Beyerdynamic DT 880 & 770