Phase 1-4: Audio stack, mixer engine, MIDI, and network API
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P2-R1: ALSA + JACK2 low-latency config (scripts, quirks, tuning) P2-R2: Carla integration (build scripts, 8ch rack config, NAM LV2 support) P2-R3: Plugin manager, categories, blacklist, NAM model support P3-R1: Mixer DSP engine (channel strip, routing matrix, bus mgr, automation) P4-R1: MIDI engine (learn mode, clock sync, HID discovery, mapping store) P4-R2: Network API (OSC server, FastAPI REST, WebSocket, auth, rate limiter) P5-R1: Touchscreen UI evaluation + main entry point docs: Audio stack, Carla integration, MIDI support, UI evaluation tests: Full test suite (292 passing)
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// RPi Audio Mixer — Web UI Application
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let ws = null;
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let sessionToken = null;
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let connected = false;
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let channelCount = 16;
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let paramState = {}; // channel -> { param_type -> value }
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// ── Logging ────────────────────────────────────────────────────────────
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function log(msg, cls) {
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const el = document.getElementById('log');
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const div = document.createElement('div');
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div.textContent = new Date().toLocaleTimeString() + ' ' + msg;
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div.className = cls || '';
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el.prepend(div);
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if (el.children.length > 50) el.lastChild.remove();
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}
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// ── Connection ──────────────────────────────────────────────────────────
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async function login() {
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const apiKey = document.getElementById('apikey-input').value;
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try {
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const resp = await fetch('/api/v1/auth/login', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json', 'X-API-Key': apiKey },
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body: JSON.stringify({ api_key: apiKey }),
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});
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const data = await resp.json();
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if (data.token) {
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sessionToken = data.token;
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document.getElementById('connect-btn').disabled = false;
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log('Session obtained (expires in ' + data.expires_in + 's)', 'log-info');
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// Auto-connect
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connectWS();
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} else {
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log('Login failed: ' + JSON.stringify(data), 'log-error');
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}
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} catch (e) {
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log('Login error: ' + e.message, 'log-error');
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}
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}
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function connectWS() {
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if (!sessionToken) {
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log('No session token — login first', 'log-error');
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return;
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}
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if (ws) ws.close();
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const proto = location.protocol === 'https:' ? 'wss:' : 'ws:';
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const url = proto + '//' + location.host + '/ws?session=' + sessionToken;
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setStatus('connecting', '● Connecting...');
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ws = new WebSocket(url);
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ws.onopen = () => {
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connected = true;
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setStatus('connected', '● Connected');
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document.getElementById('connect-btn').disabled = true;
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log('WebSocket connected', 'log-state');
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};
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ws.onclose = (e) => {
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connected = false;
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setStatus('disconnected', '● Disconnected');
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document.getElementById('connect-btn').disabled = false;
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log('WebSocket closed: ' + (e.reason || 'code ' + e.code), 'log-error');
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};
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ws.onerror = () => log('WebSocket error', 'log-error');
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ws.onmessage = handleMessage;
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}
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function disconnectWS() {
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if (ws) ws.close();
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}
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function setStatus(cls, text) {
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const el = document.getElementById('conn-status');
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el.className = 'status ' + cls;
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el.textContent = text;
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}
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// ── Message handling ────────────────────────────────────────────────────
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function handleMessage(event) {
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try {
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const msg = JSON.parse(event.data);
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switch (msg.type) {
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case 'full_state':
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handleFullState(msg.payload);
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break;
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case 'parameter_update':
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handleParameterUpdate(msg.payload);
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break;
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case 'transport_command':
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handleTransportUpdate(msg.payload);
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break;
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case 'error':
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log('Server error: ' + msg.payload.message, 'log-error');
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break;
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default:
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log('Unknown msg type: ' + msg.type, 'log-info');
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}
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} catch (e) {
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log('Parse error: ' + e.message, 'log-error');
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}
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}
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function handleFullState(state) {
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log('Full state received: ' + (state.channels ? state.channels.length : 0) + ' channels', 'log-state');
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if (state.channels) {
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channelCount = state.channels.length;
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buildChannelStrips(state.channels);
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}
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if (state.transport) {
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updateTransportUI(state.transport);
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}
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if (state.master) {
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updateMasterUI(state.master);
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}
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}
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function handleParameterUpdate(payload) {
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const { param_type, value, channel } = payload;
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if (!paramState[channel]) paramState[channel] = {};
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paramState[channel][param_type] = value;
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updateChannelUI(channel, param_type, value);
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if (param_type === 'master_volume') {
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document.getElementById('master-vol-val').textContent = value.toFixed(1) + ' dB';
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document.getElementById('master-fader').querySelector('input').value = value;
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}
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}
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function handleTransportUpdate(payload) {
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updateTransportUI(payload);
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}
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// ── Channel strip builder ───────────────────────────────────────────────
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function buildChannelStrips(channels) {
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const container = document.getElementById('channels');
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container.innerHTML = '';
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channels.forEach((ch, i) => {
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const strip = document.createElement('div');
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strip.className = 'channel-strip';
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strip.id = 'ch-' + i;
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const volDb = ch.volume_db !== undefined ? ch.volume_db : 0;
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strip.innerHTML = `
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<h4>${ch.label || 'CH' + (i + 1)}</h4>
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<div class="fader-v">
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<input type="range" min="-60" max="12" value="${volDb}" step="0.5" orient="vertical"
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oninput="sendParam('volume', this.value, ${i})">
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<span class="fader-label">Vol</span>
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<span class="fader-value">${volDb.toFixed(1)} dB</span>
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</div>
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<div class="pan-knob">
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<input type="range" min="-1" max="1" value="${ch.pan || 0}" step="0.05"
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oninput="sendParam('pan', this.value, ${i})">
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<div class="pan-value">Pan: ${((ch.pan || 0) * 100).toFixed(0)}%</div>
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</div>
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<div class="chan-buttons">
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<button class="chan-btn${ch.mute ? ' muted' : ''}" id="mute-${i}"
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onclick="toggleMute(${i})">M</button>
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<button class="chan-btn${ch.solo ? ' soloed' : ''}" id="solo-${i}"
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onclick="toggleSolo(${i})">S</button>
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</div>
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`;
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container.appendChild(strip);
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// Initialize state
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if (!paramState[i]) paramState[i] = {};
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paramState[i].mute = ch.mute || false;
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paramState[i].solo = ch.solo || false;
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paramState[i].volume = volDb;
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paramState[i].pan = ch.pan || 0;
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});
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// Update channel count in master section context if needed
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}
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function updateChannelUI(channel, paramType, value) {
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const strip = document.getElementById('ch-' + channel);
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if (!strip) return;
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switch (paramType) {
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case 'volume': {
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const fader = strip.querySelector('.fader-v input');
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const label = strip.querySelector('.fader-value');
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if (fader) fader.value = value;
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if (label) label.textContent = value.toFixed(1) + ' dB';
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break;
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}
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case 'pan': {
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const knob = strip.querySelector('.pan-knob input');
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const label = strip.querySelector('.pan-value');
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if (knob) knob.value = value;
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if (label) label.textContent = 'Pan: ' + (value * 100).toFixed(0) + '%';
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break;
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}
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case 'mute': {
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const btn = document.getElementById('mute-' + channel);
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if (btn) {
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btn.className = 'chan-btn' + (value >= 0.5 ? ' muted' : '');
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}
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break;
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}
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case 'solo': {
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const btn = document.getElementById('solo-' + channel);
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if (btn) {
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btn.className = 'chan-btn' + (value >= 0.5 ? ' soloed' : '');
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}
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break;
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}
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}
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}
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function updateMasterUI(master) {
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if (master.volume_db !== undefined) {
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document.getElementById('master-fader').querySelector('input').value = master.volume_db;
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document.getElementById('master-vol-val').textContent = master.volume_db.toFixed(1) + ' dB';
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}
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}
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function updateTransportUI(transport) {
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document.getElementById('btn-play').className = 'tbtn' + (transport.playing ? ' active' : '');
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document.getElementById('btn-record').className = 'tbtn' + (transport.recording ? ' active' : '');
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document.getElementById('btn-loop').className = 'tbtn' + (transport.loop ? ' active' : '');
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if (transport.tempo_bpm) {
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document.getElementById('tempo-display').textContent = transport.tempo_bpm.toFixed(1) + ' BPM';
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}
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if (transport.position_sec !== undefined) {
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const secs = Math.floor(transport.position_sec);
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const h = Math.floor(secs / 3600);
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const m = Math.floor((secs % 3600) / 60);
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const s = secs % 60;
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document.getElementById('time-display').textContent =
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String(h).padStart(2, '0') + ':' +
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String(m).padStart(2, '0') + ':' +
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String(s).padStart(2, '0');
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}
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}
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function toggleMute(channel) {
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const current = paramState[channel] && paramState[channel].mute ? 0 : 1;
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sendParam('mute', current, channel);
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}
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function toggleSolo(channel) {
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const current = paramState[channel] && paramState[channel].solo ? 0 : 1;
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sendParam('solo', current, channel);
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}
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// ── Sending ─────────────────────────────────────────────────────────────
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function sendParam(paramType, value, channel) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return;
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const msg = {
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type: 'parameter_update',
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payload: {
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param_type: String(paramType),
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value: parseFloat(value),
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channel: parseInt(channel),
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timestamp: Date.now() / 1000,
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},
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};
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ws.send(JSON.stringify(msg));
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}
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function sendTransport(command) {
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if (!ws || ws.readyState !== WebSocket.OPEN) return;
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ws.send(JSON.stringify({
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type: 'transport_command',
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payload: { command: command },
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}));
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}
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// ── Startup ─────────────────────────────────────────────────────────────
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// Auto-login on page load
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window.addEventListener('DOMContentLoaded', () => {
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log('Mixer UI loaded — login to connect', 'log-info');
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// Auto-login with default key
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login();
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});
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