Yamaha QY 300 Owner's Manual page 40

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Set the Time Signature (new songs only)
Move the cursor to the time signature parameter and set as required. The time
signature cannot be changed if the song already contains data.
Record
Press the key to begin recording. The step record display shown below
will appear.
Set the Note Parameters as Required
Move the cursor to the note length, velocity, and gate time parameters and set
as required.
When the cusor is located at the note length parameter the numeric keypad
can be used to enter the note lengths marked on the keys. The dot key (the [0]
key) can be used to add one or more dots to the currently selected note length.
In-between values can be entered using the [-1/NO] and [+1/YES] keys or the
data dial, or by using the numeric keypad while holding a [SHIFT] key.
When the cursor is located at the velocity parameter, the numeric keypad
can be used to directly enter the dynamic values marked on the keys (pp, mf,
etc.). In-between values can be entered using the [-1/NO] and [+1/YES] keys
or the data dial, or by using the numeric keypad while holding a [SHIFT] key.