Recording is half working. It doesn't support polyphony, but sequence is recorded. Problem was in Event_note class. I copied the class from our class project, but I didn't initialize a valuable called amp(in Event_note class). I temporally set the value for 1. Then, recording started working. Cool.
Recording feature is half working
Fixed minor issues on recording.
Recoding feature is half working. It only supports one note at a time.
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Recording only support one note at a time