Something else I haven't seen mentioned yet: many upright pianos do not have a proper 'una corda' pedal.
Typical pianos have between 2 and 3 strings for each note, all tuned to the same pitch, so the sound is full and more easily heard. The hammer typically hits all these strings with each key press.
On a grand piano, the leftmost foot pedal moves the actual keyboard and hammer assembly slightly to one side so that only a single string for each note is struck (una corda = single string). This results in a sound more like that of a pianoforte which is almost harp-like in sound.
On many upright pianos I have seen, the left pedal simply lowers a felt strip in between the hammers and strings making the sound quieter. While this is similar, it may not be what the composer had in mind for the particular piece.
I like Firefox on Android, but my chief complaint is strange scrolling behavior and refresh rate issues.
I'm no expert, but I am familiar with the concept of "tuning" the immune system to recognize cancerous cells via pharmaceuticals. Some of these treatments may cause the immune system to attack healthy tissue. I don't know if this is still the case.
I think the difference here is that the sound treatment causes the initial disruption to the cells, and then the immune system realizes (on its own) that the cells are a threat. Then, the immune system can start attacking the bad cells.