diff --git a/synth/tx_macro.h b/synth/tx_macro.h
new file mode 100644
index 0000000..f3936f0
--- /dev/null
+++ b/synth/tx_macro.h
@@ -0,0 +1,22 @@
+#include <bitset>
+
+const size_t NUM_PARAMS = 128;
+
+// Define the bitmask flags for different controls
+enum ControlFlags {
+    OP1_ENVELOPE_ATTACK1 = 0,
+    
+    NUM_FLAGS = 128
+};
+
+namespace trnr {
+    struct tx_macro {
+        float range_min;
+        float range_max;
+        float exponent;
+        std::bitset<NUM_PARAMS> control_flags; // bitset flags indicating which parameters this control affects
+
+        tx_macro(float _range_min, float _range_max, float _exponent, const std::bitset<NUM_PARAMS>& _flags)
+            : range_min(_range_min), range_max(_range_max), exponent(_exponent), control_flags(_flags) {}
+    }
+}
\ No newline at end of file