diff --git a/src/sfizz/Opcode.cpp b/src/sfizz/Opcode.cpp
index 673501d1..ff6cbc6d 100644
--- a/src/sfizz/Opcode.cpp
+++ b/src/sfizz/Opcode.cpp
@@ -210,16 +210,18 @@ absl::optional<ValueType> readOpcode(absl::string_view value, const Range<ValueT
 
 absl::optional<bool> readBooleanFromOpcode(const Opcode& opcode)
 {
-    switch (hash(opcode.value)) {
-    case hash("off"): // fallthrough
-    case hash("0"):
+    // Cakewalk-style booleans, case-insensitive
+    if (absl::EqualsIgnoreCase(opcode.value, "off"))
         return false;
-    case hash("on"):  // fallthrough
-    case hash("1"):
+    if (absl::EqualsIgnoreCase(opcode.value, "on"))
         return true;
-    default:
-        return {};
-    }
+
+    // ARIA-style booleans? (seen in egN_dynamic=1 for example)
+    // TODO check this
+    if (auto value = readOpcode(opcode.value, Range<int64_t>::wholeRange()))
+        return *value != 0;
+
+    return absl::nullopt;
 }
 
 template <class ValueType>
diff --git a/src/sfizz/Range.h b/src/sfizz/Range.h
index 3b548535..7bbe369f 100644
--- a/src/sfizz/Range.h
+++ b/src/sfizz/Range.h
@@ -8,6 +8,7 @@
 #include "MathHelpers.h"
 #include <initializer_list>
 #include <type_traits>
+#include <limits>
 
 namespace sfz
 {
@@ -116,6 +117,17 @@ public:
         };
     }
 
+    /**
+     * @brief Construct a range which covers the whole numeric domain
+     */
+    static constexpr Range<Type> wholeRange() noexcept
+    {
+        return Range<Type> {
+            std::numeric_limits<Type>::min(),
+            std::numeric_limits<Type>::max(),
+        };
+    }
+
 private:
     Type _start { static_cast<Type>(0.0) };
     Type _end { static_cast<Type>(0.0) };
diff --git a/tests/OpcodeT.cpp b/tests/OpcodeT.cpp
index 771db749..a2ade6a7 100644
--- a/tests/OpcodeT.cpp
+++ b/tests/OpcodeT.cpp
@@ -280,3 +280,14 @@ TEST_CASE("[Opcode] readOpcode")
     REQUIRE( !sfz::readOpcode("garbage50.25", sfz::Range<int>(-20, 100)) );
     REQUIRE( !sfz::readOpcode("garbage", sfz::Range<int>(-20, 100)) );
 }
+
+TEST_CASE("[Opcode] readBooleanFromOpcode")
+{
+    REQUIRE(sfz::readBooleanFromOpcode({"", "1"}) == true);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "0"}) == false);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "777"}) == true);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "on"}) == true);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "off"}) == false);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "On"}) == true);
+    REQUIRE(sfz::readBooleanFromOpcode({"", "oFf"}) == false);
+}