diff --git a/plugin/assigner.cpp b/plugin/assigner.cpp
index 3135207..1cd8c22 100644
--- a/plugin/assigner.cpp
+++ b/plugin/assigner.cpp
@@ -43,7 +43,12 @@ Assigner::Assigner() {
 }
 
 void Assigner::handleMidi(MidiEvent* ev) {
+
     uint8_t status = ev->data[0];
+    
+    //printf("called with event %04x (%02x): %02x %02x %02x\n", ev->frame, ev->size,  ev->data[0], ev->data[1], ev->data[2]);
+    if (ev->size > 3) return; // sysex bug
+    
     switch (status & 0xf0) {
         case 0x80:
             noteOff(ev->data[1]);
diff --git a/plugin/module.cpp b/plugin/module.cpp
index 1d4c3a6..d873111 100644
--- a/plugin/module.cpp
+++ b/plugin/module.cpp
@@ -92,9 +92,12 @@ void Module::run(Voice* voices, uint32_t blockSize) {
 
     master = powf(2, (patchRam.vca / 31.75 - 4.0f)) * 0.1;
 
-    square = (patchRam.switch1 & 0x08) ? 0.28 : 0;
-    saw = (patchRam.switch1 & 0x10) ? .36 : 0;
-    sub = (patchRam.sub / 127.0f) * 0.4;
+    // originally I had 0.28, 0.36, 0.4
+    // measurement suggests that saw and square are around 100mV each with sub 160mV
+    
+    square = (patchRam.switch1 & 0x08) ? 0.3 : 0;
+    saw = (patchRam.switch1 & 0x10) ? .3 : 0;
+    sub = (patchRam.sub / 127.0f) * 0.48;
 
     res = patchRam.vcfReso / 127.0;
     noise = (patchRam.noise / 127.0) * 0.4;