Dynamic changes to LFO

www/bootstrap.js

@@ -360,6 +360,20 @@ class PatchRouter {
     }
 }
 
+// ── Waveform sample (mirrors Rust waveform_sample) ───────────────────────────
+
+function waveformSample(waveIdx, phase) {
+    const TAU = 2 * Math.PI;
+    switch (waveIdx) {
+        case 0: return Math.sin(phase * TAU);                                       // Sine
+        case 1: return 2 * phase - 1;                                               // Saw
+        case 2: return phase < 0.5 ? 1 : -1;                                       // Square
+        case 3: return 4 * Math.abs(phase - Math.floor(phase + 0.5)) - 1;          // Triangle
+        case 4: return phase < 0.25 ? 1 : -1;                                      // Pulse
+        default: return 0;
+    }
+}
+
 // ── Computer keyboard map (standard DAW layout) ───────────────────────────────
 
 const KEY_NOTE = {
@@ -401,6 +415,15 @@ async function bootstrap() {
         const ro = new ResizeObserver(() => allCanvases.forEach(fitCanvas));
         allCanvases.forEach(c => ro.observe(c));
 
+        // ── Component registry: param min/max for CV display scaling ─────────
+        // { kind → { paramId → { min, max } } }
+        const paramRanges = new Map(
+            JSON.parse(patchbay.available_components()).map(c => [
+                c.kind,
+                new Map(c.params.map(p => [p.id, { min: p.min, max: p.max }]))
+            ])
+        );
+
         // ── Default patch bay layout ──────────────────────────────────────────
         const cw = pbCanvas.width || pbCanvas.clientWidth || 800;
         patchbay.add_module("vco",  cw * 0.08, 80);
@@ -500,6 +523,37 @@ async function bootstrap() {
             const outLabel = router.isOutputPatched() ? "patched" : "unpatched";
             status.textContent = router.isOutputPatched() ? "Running · output patched" : "Running · output unpatched";
 
+            // ── Push live CV modulation offsets to the patchbay for display ──
+            // This makes param bars and waveform previews reflect CV-modulated
+            // values even when the knob hasn't moved.
+            {
+                const patch = JSON.parse(patchbay.get_patch_json());
+                patchbay.clear_cv_mods();
+                for (const cable of patch.cables) {
+                    if (!cable.dst_jack.startsWith("cv_")) continue;
+                    const srcMod = patch.modules.find(m => m.id === cable.src);
+                    if (!srcMod || srcMod.kind !== "lfo") continue;
+
+                    const paramId = cable.dst_jack.slice(3); // "cv_rate_hz" → "rate_hz"
+                    const dstMod  = patch.modules.find(m => m.id === cable.dst);
+                    if (!dstMod) continue;
+
+                    const range = paramRanges.get(dstMod.kind)?.get(paramId);
+                    if (!range) continue;
+
+                    // LFO normalised output: -depth..+depth
+                    const rate    = srcMod.params.rate_hz ?? 2;
+                    const depth   = srcMod.params.depth   ?? 0.5;
+                    const waveIdx = Math.round(srcMod.params.waveform ?? 0);
+                    const phase   = ((now / 1000) * rate) % 1.0;
+                    const lfoNorm = waveformSample(waveIdx, phase) * depth;
+
+                    // Scale to ±½ of the param's full range for display
+                    const offset = lfoNorm * (range.max - range.min) * 0.5;
+                    patchbay.set_cv_mod(dstMod.id, paramId, offset);
+                }
+            }
+
             oscilloscope.draw();
             spectrum.draw();
             patchbay.draw(now);