Topic: Changing the sound speed
'Sound speed' in the mics section is a parameter that I had ignored until just now. But I've discovered that it's quite a useful tool to focus the sound without messing around with mic positions. It's particularly valuable in Stereophonic mode, in which the mic positions are fixed and invisible. Just increase the sound speed for a sharper sound.
In the real world, though, the air temperatures necessary to achieve values much higher than 350 would surely be catastrophic for the piano (and everything else in the studio). See https://hypertextbook.com/facts/2000/CheukWong.shtml