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Added classes related to sequence recording from class project. But we still need to modify those so that they work in our project. Also added class method that gets frequency from given number of midi notes. Still needed to fix the problem of distorted sound when sequence and keyboard played are played at the same time.
Added a method (addChordEvent) and code in sequencer class, but still need to fix.
Mostly revised addChordEvent-related code.  Recording still does not work, but the general framework is better.
Debugging.
Removed looping (caused bug). Now it is getting duration and right notes when recording. Still don't get playback.
Added debugging things in loopSwitch method in view controller class.
Added autoreleaspool
just removed unnecessary line of code.
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
Changed Event_Note and AQPlayer (getSynth method). Still polyphony recording doesn't work.