- I integrated the unison detune feature and made sure the whole system works well. I am integrating ADSR and adapting the existing division table so that the oscillator and ADSR can share the same table.
- As I was implementing the arpeggiator, I found out that the arpeggiator functionalities we originally planned to implement have already been implemented by the keyboard. With the MIDI message the keyboard sends, we don’t have enough information to recreate the same functionalities in FPGA. The keyboard only sends out MIDI note messages at the configured rate and pattern. It does not send
control_changemessages for the arpeggiator configuration buttons and it’s impossible to figure out which piano key on the keyboard is pressed based on the MIDI note message since the octave transpose makes 3 keys being able to produce the same MIDI note message. - After discussion with Hongrun and Michelle, we decided to implement a “record-and-cycle” function instead. This feature allows the user to have a custom “spacing” between the notes, not just 1/4 notes at some tempo like the arpeggiator. This feature is not so different from arpeggiator on the implementation level in the sense that both functionalities capture notes and then play the captured notes at some rate. We think it augments the arpeggiator feature and is a good proof-of-concept for what we originally would have implemented. Users still get the same functionality.
- To compensate for the change to the arpeggiator, we decide to add pre-configured stored wavetables and add the functionality to modulate between two waveforms.
I think I will be able to finish everything by the video deadline.
I will work on the remainder of the record-and-cycle feature and the modulation feature next week.