Finally had some time...

A project log for KELPIE: Subtractive Synth for Keyboard Controllers

A portable, cheap, and easy to use, monophonic + polyphonic digital synthesizer for use with a MIDI controller

kenneth-marutKenneth Marut 11/03/2019 at 20:270 Comments

It's been a while since I've worked on the Kelpie as I've been so busy starting a new job. I finally had some time over the weekend to get things working again and attempting to tackle some bugs. I built a debugging/test fixture and tried to hook up the J-Link debugger with PlatformIO, but couldn't get it to wor.k I haven't found much support online for debugging the Teensy 3.2 platform, so I decided to move on and just stick with good ol' Serial.prints.

I fixed a lot of issues, uncovered some new ones, but I'm happy with the progress and I'm planning to mail one of my units to a friend to get some initial feedback. I added some cool new functionality, including a MIDI LED that flashes whenever a key is pressed, as well as routing the LFO to the master gain, and support for MIDI CC messages, so the knobs can be over written by MIDI messages (which is super cool). I was worried that I'd have issues with the built-in knobs fighting with the MIDI CC messages, but luckily I had written the knob functionality with that in mind (accidentally? I can't remember...)

I've been avoiding doing the glide functionality because I just don't have the mental capacity right now