Ayre K-5xeMP direct input selection using hidden remote codes

The original remote of Ayre K-5xeMP doesn't allow direct selection of the input source.  It turned out that the amplifier is capable of that via IR control, but the remote lacks keys for that.  This amplifier uses the standard RC-5 format with the device code of 16.  I found the following codes that the original remote doesn't have keys for:

OBC/Function
1/B1
2/B2
3/S1
4/S2
56/mute off (not toggle)
57/mute on (not toggle)

These codes can be set to any JP1 programmable remote and let your favorite remote learn from it.

Although I don't have a way to confirm this, these codes may work on KX-5 and KX-R which also seem to lack direct input selection with the original remote.