Hello, Ken. Thank you for your prompt reply.
And, however, with the method you told me, I cannot hear the key I just pressed from the speaker.
And I cannot hear anything when I play the keys.
When I used Sound Blaster several years ago,
the Sound Blaster card can let me hear the key I press on the piano roll
and when I play the keys I composed, I can hear the music I made from the speaker.
How can I do these, Ken? Please instruct me once more.
Thank you again.