diff --git a/Source/LcdPanel.cpp b/Source/LcdPanel.cpp
index 5049f09..2f44a92 100644
--- a/Source/LcdPanel.cpp
+++ b/Source/LcdPanel.cpp
@@ -644,7 +644,8 @@ void LcdPanel::drawParamScreen (juce::Graphics& g)
     pxTextM (g, 3, 1, paramScreenTitle (paramScreenIdx), 1.0f);
     drawFilled (g, 3, 6, gridW - 6, 1, 0.35f);
 
-    static const prm::Id voice[]  = { prm::Id::osc1Wave, prm::Id::osc2Wave, prm::Id::detune, prm::Id::oscMix };
+    static const prm::Id voice[]  = { prm::Id::osc1Wave, prm::Id::osc2Wave, prm::Id::detune1, prm::Id::detune, prm::Id::oscMix };
+
     static const prm::Id filter[] = { prm::Id::fltType, prm::Id::fltCutoff, prm::Id::fltRes, prm::Id::fltEnv, prm::Id::fltKey };
     static const prm::Id envMt[]  = { prm::Id::ampA, prm::Id::ampD, prm::Id::ampS, prm::Id::ampR, prm::Id::fenvA, prm::Id::fenvD, prm::Id::fenvS, prm::Id::fenvR };
     static const prm::Id lfo[]    = { prm::Id::lfoRate, prm::Id::lfoShape, prm::Id::lfoDepth, prm::Id::lfoTarget };
@@ -743,7 +744,7 @@ int LcdPanel::paramCountForScreen (int idx) const
 {
     switch (idx)
     {
-        case 0: return 4;
+        case 0: return 5;
         case 1: return 5;
         case 2: return 8;
         case 3: return 4;
@@ -842,7 +843,7 @@ void LcdPanel::stepParam (prm::Id id, int dir, bool coarse)
 
 static prm::Id paramForCursor (int screenIdx, int row)
 {
-    static const prm::Id voice[]  = { prm::Id::osc1Wave, prm::Id::osc2Wave, prm::Id::detune, prm::Id::oscMix };
+    static const prm::Id voice[]  = { prm::Id::osc1Wave, prm::Id::osc2Wave, prm::Id::detune1, prm::Id::detune, prm::Id::oscMix };
     static const prm::Id filter[] = { prm::Id::fltType, prm::Id::fltCutoff, prm::Id::fltRes, prm::Id::fltEnv, prm::Id::fltKey };
     static const prm::Id envMt[]  = { prm::Id::ampA, prm::Id::ampD, prm::Id::ampS, prm::Id::ampR, prm::Id::fenvA, prm::Id::fenvD, prm::Id::fenvS, prm::Id::fenvR };
     static const prm::Id lfo[]    = { prm::Id::lfoRate, prm::Id::lfoShape, prm::Id::lfoDepth, prm::Id::lfoTarget };
diff --git a/Source/Params.cpp b/Source/Params.cpp
index 6441c36..b5ae80c 100644
--- a/Source/Params.cpp
+++ b/Source/Params.cpp
@@ -7,7 +7,7 @@ static const Desc table[num] = {
     // id             name           short      min       max      def      disc   fine    coarse
     { "osc1wave",    "OSC1 WAVE",    "O1WV",    0,        4,       2,       true,  1,     1 },
     { "osc2wave",    "OSC2 WAVE",    "O2WV",    0,        4,       3,       true,  1,     1 },
-    { "detune",      "DETUNE",       "DTN",    -50,       50,       8,       false, 1,     6 },
+    { "detune",      "DETUNE 2",     "DT2",    -50,       50,       8,       false, 1,     6 },
     { "oscmix",      "OSC BAL",      "MIX",     0,        100,      52,      false, 1,     8 },
     { "flttype",     "FILTER TYPE",  "FTYP",    0,        3,        1,       true,  1,     1 },
     { "fltcut",      "CUTOFF",       "CUT",     20,       20000,    3400,    false, 20,    400 },
@@ -40,6 +40,7 @@ static const Desc table[num] = {
     { "arppattern",  "ARP PATTERN",  "APT",     0,        3,        0,       true,  1,     1 },
     { "arpoct",      "ARP OCTAVES",  "AOC",     1,        4,        1,       true,  1,     1 },
     { "arpgate",     "ARP GATE",     "AGT",     10,       100,      70,      false, 1,     10 },
+    { "detune1",     "DETUNE 1",     "DT1",    -50,       50,       0,       false, 1,     6 },
 };
 
 const Desc& desc (Id id)  { return table[static_cast<int>(id)]; }
@@ -171,7 +172,8 @@ juce::String formatParam (Id id, float v)
     {
         case Id::osc1Wave:
         case Id::osc2Wave: return waveName ((int) v);
-        case Id::detune:   return juce::String ((int) v > 0 ? "+" : "") + juce::String ((int) v) + "c";
+        case Id::detune:
+        case Id::detune1:  return juce::String ((int) v > 0 ? "+" : "") + juce::String ((int) v) + "c";
         case Id::oscMix:   return juce::String ((int) (100.0f - v)) + "/" + juce::String ((int) v);
         case Id::fltType:  return fltTypeName ((int) v);
         case Id::fltCutoff:
diff --git a/Source/Params.h b/Source/Params.h
index f074784..e82e9e4 100644
--- a/Source/Params.h
+++ b/Source/Params.h
@@ -12,10 +12,11 @@ enum class Id : int {
     fxType,   fxAmt,      fxTime,
     vol,      pan,        poly,       glide, tune,
     hq,
-    arpOn,    arpRate,    arpPattern, arpOct, arpGate
+    arpOn,    arpRate,    arpPattern, arpOct, arpGate,
+    detune1
 };
 
-constexpr int num = 35;
+constexpr int num = 36;
 
 struct Desc {
     const char* id;
diff --git a/Source/SynthEngine.cpp b/Source/SynthEngine.cpp
index 984bfb0..d84c339 100644
--- a/Source/SynthEngine.cpp
+++ b/Source/SynthEngine.cpp
@@ -125,7 +125,8 @@ void SynthEngine::render (const VParams& p, float* left, float* right, int num)
 
     const float glideRate = p.glide <= 0.001f ? 1.0f
                          : 1.0f - std::exp (-1.0f / (p.glide * (float) sr));
-    const float detuneRatio = std::exp2f (p.detune / 1200.0f);
+    const float detuneRatio2 = std::exp2f (p.detune / 1200.0f);
+    const float detuneRatio1 = std::exp2f (p.detune1 / 1200.0f);
     const float tuneRatio   = std::exp2f (p.tune / 12.0f);
     const float maxFc = 0.4f * (float) sr;
     const float minFc = 30.0f;
@@ -175,8 +176,8 @@ void SynthEngine::render (const VParams& p, float* left, float* right, int num)
                 bendSmooth += (bendCents - bendSmooth) * 0.08f;
             freq *= std::exp2f (bendSmooth / 1200.0f);
 
-            const float d1 = (float) (freq / sr);
-            const float d2 = d1 * detuneRatio;
+            const float d1 = (float) (freq / sr) * detuneRatio1;
+            const float d2 = (float) (freq / sr) * detuneRatio2;
 
             v.ph1 += d1; if (v.ph1 >= 1.0) v.ph1 -= 1.0;
             v.ph2 += d2; if (v.ph2 >= 1.0) v.ph2 -= 1.0;
diff --git a/Source/SynthEngine.h b/Source/SynthEngine.h
index 38a17df..6e8d086 100644
--- a/Source/SynthEngine.h
+++ b/Source/SynthEngine.h
@@ -5,6 +5,7 @@
 struct VParams
 {
     float osc1w = 2, osc2w = 3, detune = 8, oscMix = 52.f;
+    float detune1 = 0;
     float fltType = 1, fltCut = 3400.f, fltRes = 0.18f, fltEnv = 52.f, fltKey = 40.f;
     float ampA = 0.008f, ampD = 0.26f, ampS = 0.70f, ampR = 0.35f;
     float fA = 0.02f, fD = 0.16f, fS = 0.26f, fR = 0.25f;
@@ -18,6 +19,7 @@ struct VParams
     {
         auto get = [&] (const char* id) { return apvts.getRawParameterValue (id) -> load(); };
         osc1w    = get ("osc1wave"); osc2w = get ("osc2wave"); detune = get ("detune");
+        detune1  = get ("detune1");
         oscMix   = get ("oscmix");
         fltType  = get ("flttype");  fltCut = get ("fltcut"); fltRes = get ("fltres");
         fltEnv   = get ("fltenv");   fltKey = get ("fltkey");
@@ -69,8 +71,11 @@ public:
         switch (st)
         {
             case Atk:
+                // (1-cur)*k converges to 1.0 only asymptotically in float and can
+                // stall below 1.0 forever, so clamp with a tolerance to guarantee
+                // the attack always hands off to the decay stage.
                 cur += (1.0f - cur) * std::min (1.0f, (float) (attTau * srInv) * 8.0f);
-                if (cur >= 1.0f) { cur = 1.0f; st = Dec; }
+                if (cur >= 1.0f - 1.0e-4f) { cur = 1.0f; st = Dec; }
                 break;
             case Dec:
                 cur = susL + (cur - susL) * std::exp (-decTau * (float) srInv);