Overview | Circuit Playground Express USB MIDI Controller and Synthesizer | Adafruit Learning System
CRAFTsynth 2.0 - Modal Electronics
JUCE: Tutorial: Build a MIDI synthesiser
Is there a way to turn a MIDI controller into a synthesizer? - Quora
Amazon.com: AKAI Professional LPK25 - USB MIDI Keyboard Controller with 25 Responsive Synth Keys for Mac and PC, Arpeggiator and Music Production Software : Everything Else