It's Called a "Finger-substitution"
I learned this one as an organist and it's stood me in good stead.
What's the trick, you ask?
Here it is, but I suspect you'll need some additional explanation to use it successfully:
The trick is simple - if there is a longer note you can hold it down and
change fingers on it while holding it down. Yeah, there are some piano
notes you can do this with.
Pianists don't use it much or at least not all that well. That's because you don't get any sustaining notes on acoustic piano.
What do I mean by this?
Well, once you hit the piano key, that's all she wrote. There in no way you can affect it after that. The notes will sound and then decay as the strings damps out.
Not so with an organ (or any instrument sound that continues until the key is released.) Once you've pushed that key down it will sound at full volume until you let up.
That means that organ notes tend to last longer.
Now you may have never played an organ before. Still, this works on any sound that continues.
I call such sounds "sustaining sounds" as opposed to "decaying sounds." Sustaining sounds are often winds and brasses. Guitars and pianos are decaying sounds as they are based on the sounds made by the damping out of strings.
Since longer notes are needed for this fingering trick, it is more common on organ than piano as there are longer notes for sustaining sounds than decaying sounds.
The trick is simple - if there is a longer note you can hold it down and change fingers on it while holding it down. Yeah, there are some piano notes you can do this with.
I'll keep on extending this invite - you can always email me with your fingering troubles and I'll be happy to advise you for nothing.
