How to change digital piano master volume using python like Yamaha Smart Pianist app

[Indrajeet Raval]

import mido

# Define MIDI port name (adjust as necessary)
port_name = 'Digital Piano 1'

# Open MIDI output port
output_port = mido.open_output(port_name)

# Define MIDI channel (1-16)
channel = 0  # Note: MIDI channels are zero-indexed, so channel 1 corresponds to index 0

# Define Control Change message for volume (CC #7)
volume_cc = 7

# Define volume value (0-127)
volume_value = 1  # Adjust as needed

print("Available MIDI output ports:")
for port_name in mido.get_output_names():
    print(port_name)

# Create Control Change message for volume on the specified channel
volume_message = mido.Message('control_change', channel=channel, control=volume_cc, value=volume_value)

# Send the Control Change message
output_port.send(volume_message)

# Close MIDI output port
output_port.close()

OUTPUT:
PS C:\Users\P125ab> python main.py
Available MIDI output ports:
Microsoft GS Wavetable Synth 0
Digital Piano 1

When I executed above code and pressed Yamaha digital piano P125ab keys, master volume wasn't changed at all.

The same thing I can do if I connect Smart Pianist App. Open Balance Window at the bottom and move slider up and down to change master volume in android app. If I press

any digital piano keys, as per fader the sound will come from digital piano.

Is above code enough to test master volume? Or what else should be done to achieve the same functionality. 

Thanks,

Indrajeet Raval