Yamaha P-150 Owner's Manual page 66

Cannot transmit MIDI messages Check that message types are turned off in the MIDI Filter menu of Edit mode, and that the
even though the MIDI Transmit
switch is on
The sound of the connected
MIDI instruments is too soft
(or too loud)
Connected MIDI instruments
sound, but do not change
programs when changing voices
or Performances on the P-150
Sustain (Footswitch pedal
operation) doesn't work properly
Cannot select the Organ 1 voice The Organ 1 voice is not accessible in Dual mode.
Transpose value or split point
cannot be changed by using
the [DATA ENTRY] slider,
or balance and detune
be values cannot changed by
the [-1/NO] or [+1/YES] buttons
Transmit channel is not set to off in Edit mode. (See page 47.)
Check that the Keyboard Sensitivity settings are appropriate. (See page 51.)
Check that the program change receive (or the equivalent parameter) on the receiving MIDI
instrument has not been turned off.
Check that the Footswitch is properly connected to the [SUSTAIN] jack.
You cannot use the [DATA ENTRY] slider to change the transpose value or split point; you
must hold the [TRANSPOSE] or [SPLIT] button and use the [-1/NO] or [+1/YES] buttons.
Likewise, you cannot use the [-1/NO] or [+1/YES] buttons to change the balance or detune
values; you must hold the [BALANCE] or [DETUNE] button and move the [DATA ENTRY]
slider.
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