i have an issue at drum mode in VS1053

I and my friends are making a electronical drum using vs 1053 with arduino in school. Everything is fine, but we have a some issue at drum mode. The note 46, 44, 50,45 don’t work when we use it with Piezo sensor(working with Piezoelectricity). As i said, others is good, but only that notes linked in sensor can’t make sounds. I really want to solve this problem, so if this problem is caused by only VS 1053, please tell me how could we fix this problem. For other cases, i submit the our arduino program. i’ll be waiting your answer. Thank you.

drum.zip (2.48 KB)

MIDI is always tricky :-/ There might be some sort of conflict? Here’s the datasheet https://www.sparkfun.com/datasheets/Com … vs1053.pdf and the MIDI spec http://www.gweep.net/~prefect/eng/refer … .html#Bank