Bake window derives itself: %-knob fold, declick pad, Gate held to exhaustion, preview velocity; Hold is the one knob a loop needs

src/core/instrument/ui/bake_hold.cpp

@@ -0,0 +1,25 @@
+// bake_hold.cpp — see bake_hold.h. Pure math; no host types.
+
+#include "core/instrument/ui/bake_hold.h"
+
+#include <algorithm>
+
+namespace reasampler::instrument::ui {
+
+namespace {
+constexpr int kLastIndex = note::kDivisionCount - 1;
+}  // namespace
+
+note::Division bakeHoldFromNorm(double norm) {
+    if (!(norm > 0.0)) return note::divisionAt(0);  // also catches NaN
+    if (norm >= 1.0) return note::divisionAt(kLastIndex);
+    // Round to nearest so each rung owns an equal slice of the knob's travel; divisionAt
+    // clamps, so the +0.5 landing on kDivisionCount at norm just under 1 is harmless.
+    return note::divisionAt(static_cast<int>(norm * kLastIndex + 0.5));
+}
+
+double bakeHoldNorm(note::Division hold) {
+    return static_cast<double>(note::divisionIndex(hold)) / static_cast<double>(kLastIndex);
+}
+
+}  // namespace reasampler::instrument::ui