Building an Operating System for a 2002 Lowrey Organ

I am rebuilding a Lowrey Jamboree LC/20 as a self-contained intelligent
performance organ.

The organ remains a real Lowrey: its keyboards, pedals, rhythm section,
sounds, toe switches, and expression pedal still work as designed. A
dedicated Ubuntu computer now lives inside it, connected through USB
MIDI and a USB audio interface that listens to the actual sound coming
from the organ.

The goal is not to turn the Lowrey into a generic MIDI keyboard. It is
to give it the abilities it never had: a sequencer, a searchable music
library, a recorder, a visual performance console, programmable
controls, audio monitoring, and eventually an AI composer and
performance-assistance system.

The computer can already send MIDI to the LC/20 and receive MIDI back
from it. That means it can play the organ's Upper, Lower, Bass, Lower
Solo, and Drum sections independently. It can also observe what the
physical instrument is doing: keyboard notes, expression pedal movement,
sustain, rhythm state, and selected physical controls.

A major part of the project is that the computer listens to the real
organ audio, not merely the MIDI it sends. The Lowrey's headphone/audio
output feeds a dedicated USB capture interface. The system can measure
level, peak, clipping, silence, and actual waveform data without routing
the signal back to speakers or creating feedback.

The new performance screen has become an instrument panel rather than a
normal web dashboard. It shows a 60-frame-per-second oscilloscope of the
actual Lowrey audio, live level meters, playback state, queue position,
hardware state, temperature, memory, and recording status.

It also contains a visual representation of the organ itself: Upper and
Lower keyboard strips, bass pedals, drum pads, section lamps, expression
level, sustain, rhythm, FX, playback, MIDI input, MIDI output, and audio
status. Physical notes light green. Notes being played by the computer
light amber. If both occur on the same note, the display turns red.

The system already has a large local MIDI library. More than 107,000
MIDI files were imported from a personal collection and can be searched
quickly from the interface. Tracks can be played directly from the
Incoming library, kept in an Approved collection, deleted, queued, or
saved into playlists.

Internet acquisition is also underway. The Library screen includes
verified public MIDI sources for Bach and Baroque music, hymns and
chorales, jazz, and game themes. A selected file is imported into the
local library, where it can be played, added to a queue, or saved into a
playlist.

Playback is direct and native. The system sends the MIDI file's timing,
channels, controllers, velocities, and SysEx events through to the
organ. It also maintains a deterministic cleanup path at the end of
playback or when stopped, preventing stuck notes.

A multi-song queue now works on the physical LC/20. It has been tested
with sequential tracks, live MIDI activity, actual audio capture, and
cleanup between songs. Recordings can capture the sound that the Lowrey
actually produced as WAV files, with playback metadata and provenance.

The current interface is being redesigned as a full-screen Organ OS
desktop. Instead of a conventional browser page, it has an
appliance-style system bar, application dock, workspace windows, and a
performance control room designed for a portrait display mounted in the
organ's music holder.

The next stages are about turning this from a powerful jukebox and
instrument monitor into a true performance system: better playlists and
library organization, automatic loudness management based on the real
audio output, more learned physical controls, macro triggers,
OBS-friendly audio output, assisted performance modes, and local
AI-generated structured compositions.

The idea is simple: the computer should disappear into the Lowrey. The
organ should feel as though it has acquired a lifetime of music, a
recording studio, a control room, and eventually a musical collaborator.