Yamaoka never used an actual piano on any the sound tracks. The piano on the Silent Hill 2 soundtrack, for example, is very obviously not real. There's an old virtual instrument/sampler called SampleTank that has a piano called "1920s Upright Piano" that is close to the one he used.
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Last edited by VIVIsect on 12 Sep 2014, edited 1 time in total.
It's understandable though, given the time and expense of setting up, miking, and properly recording an actual acoustic piano. It probably wouldn't be a big deal for a large production, with a group of engineers and the money to dump into the studio time, but I think Yamaoka was mostly on his own and probably under a ridiculous time crunch.
Back in the day, SampleTank was really popular, and I'd bet he used it for his piano during the SH2 days. For SH3, he used a much better, more realistic sounding sampled piano. I have no idea what he was using, but it sounded really great (especially for the time).