June-21 is a Roland Juno / MKS-50 emulation.
June-21 can read and play Juno 1 / 2 MKS-50 presets. The emulator includes Juno 2 factory “Preset” and “Memory” bank tones. Many tones can be found on the web, in a form of a .SYX bulk dump extracted from synths.
The text and schematics are partly inspired by the original Juno-2 documentation. The look of the GUI is obviously inspired by the Roland PG-300.
Nota Bene: June-21 is still in development and is not a perfect emulator, so some tones can be far from the real thing and some won’t work (but some can be very accurate and pleasing!). As of now (Dec 2019) some things are not implemented : Portamento, chord memory, octave transpose : not done yet Aftertouch : won’t be done (at least by me) as my own Juno-2’s aftertouch is not working.