Hi, thanks for posting,
yes, regarding the CAPI VP26 the APP992 is a drop in replacement of the GAR2520 op amp, so isn't needed any modify on this pre.
Yes, the APP992 is a clean opamp with big dynamic and moreover with not aggressive highs, and also with solid basses.
It's a very used DOA for pres.
Yes, there are sound clips.
Pier Paolo