Yes indeed! I gaffer taped a pair of tiny DPA 4060 omnis inside (interesting stereo image) & ended up using a mixer so I could route to/from FX & looper a bit easier… My quarantine home work is teaching myself to play a slow motion version of Bill Evans Peace Piece…
BTW the piano tuner was interesting to observe at work - he only used a reference pitch once at the beginning, a tuning fork which showed the piano hadn’t been tuned for a while and was about a quarter tone flat overall… Not sure why but I presumed he would have a strobe tuner or something, but everything else he did by ear, and afterwards we had an interesting conversation about ‘voicing’ pianos (he worked in UK for many years, tuning & voicing concert pianos) - I have to say I was thankful for ignoring someones advice here about how tuning a piano is not rocket science, just DIY it! etc… Really appreciated his skill and musicality (he had a test play on every one of my bass guitars, and I showed him the microtonal tuning of my megabass waterphone) - a great learning experience, and the tuned piano sounds gorgeous!