Yamaha PSR-SX900 Reference Manual page 76

Mix
This function lets you mix the data of two channels and place the results in a different channel. Touch one of the menu
items below, and then touch the instrument icon or the box below for the desired channel.
Source 1
Source 2
Destination
Copy
This function lets you copy the data from one channel to another. Touch one of the menu items below, and then touch
the instrument icon or the box below for the desired channel.
Source
Destination
Transpose
This allows you to transpose the recorded data of individual channels up or down by a maximum of two octaves in
semitone increments. Touch the box below the instrument icon for the channel to be transposed, then edit the value. If
you want to transpose all channels simultaneously, use the menu below.
All +
All -
NOTE
Make sure not to transpose channels 9 and 10. In general, Drum kits are assigned to these channels. If you transpose the channels of Drum kits, the instruments assigned
to each key will be changed.
NOTE
If you want to listen to the data as currently edited, play it back before touching [Execute]. Touching [Execute] transposes the pitch, and also resets the value to 0 allowing
you to further transpose, if necessary.
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PSR-SX900/SX700 Reference Manual
Determines the MIDI channel (1–16) to be mixed. All MIDI events of the channel specified here
are copied to the destination channel.
Determines the MIDI channel (1–16) to be mixed. Only note events of the channel specified here
are copied to the destination channel.
Determines the channel into which the mix results will be placed.
Determines the MIDI channel (1–16) to be copied. All MIDI events of the channel specified here
are copied to the destination channel.
Determines the channel into which the copy results will be placed.
Increases the Transpose value for all channels by 1.
Decreases the Transpose value for all channels by 1.