Bösendorfer 225, use of extra 4 keys

[artlin02]

Is there any pieces using the extra four keys on the Bösendorfer model 225. I know there is for the Bösendorfer imperial, but can't find any for the 225. Would also appreciate a YouTube video, if you can find.

[dogperson]

from an internet search
Ravel:   https://vimeo.com/77304474

Rach:  

 

Edited to add:   these two pieces were not written specifically for the extra keys-- but were recorded using them.  There are probably many more where it would be effective-- ie., Debussy's Sunken Cathedral

[iansinclair]

Not specifically for the Bosendorfer, but a more general comment: there are a number of pieces where adding a few bass notes is appropriate (some of the Chopin Nocturnes come to mind immediately).  So why didn't the composers write them in in the first place?  Because their pianos didn't have them.  Use good judgement...