For guitar, a useful review asks more than whether the line is audible. We want to listen for pick attack, sustain, and what remains of the part’s role beside bass, drums, and voice. No Prism guitar result is published here.
The reference excerpt needs additional audition gain for piano because the part sits quietly in the arrangement. That helps listening, but it also rules out treating this example as a level-matched quality comparison.
A convincing before-and-after needs the original source, the exact candidate output, the version that created it, and a listening task. Until those are available together, a comparison is only a plan—not evidence about Prism.
Source multitracks are valuable reference material, but they bypass the difficult act of separation. They can explain what we listen for; they cannot stand in for a model output or prove a model’s quality.
Labs shares the model direction and the evidence we need to inspect. Prism names the separation work in development. Soundfield Studio is where validated capabilities can become listening and practice tools.