diff --git a/src/engine/fileOpsIns.cpp b/src/engine/fileOpsIns.cpp
index 842f29f7..9668c8d9 100644
--- a/src/engine/fileOpsIns.cpp
+++ b/src/engine/fileOpsIns.cpp
@@ -156,7 +156,7 @@ void DivEngine::loadDMP(SafeReader& reader, std::vector<DivInstrument*>& ret, St
           break;
         default:
           logD("instrument type is unknown");
-          lastError="unknown instrument type!";
+          lastError=fmt::sprintf("unknown instrument type %d!",sys);
           delete ins;
           return;
           break;
@@ -183,7 +183,14 @@ void DivEngine::loadDMP(SafeReader& reader, std::vector<DivInstrument*>& ret, St
           }
         }
       } else {
-        ins->type=DIV_INS_FM;
+        if (sys==3 || sys==6) {
+          ins->type=DIV_INS_OPLL;
+        } else if (sys==1) {
+          ins->type=DIV_INS_OPL;
+        } else {
+          ins->type=DIV_INS_FM;
+        }
+        
       }
     } else {
       ins->type=DIV_INS_FM;
@@ -240,12 +247,23 @@ void DivEngine::loadDMP(SafeReader& reader, std::vector<DivInstrument*>& ret, St
           ins->fm.op[j].dvb=reader.readC();
           ins->fm.op[j].dam=reader.readC();
         } else {
-          ins->fm.op[j].rs=reader.readC();
-          ins->fm.op[j].dt=reader.readC();
-          ins->fm.op[j].dt2=ins->fm.op[j].dt>>4;
-          ins->fm.op[j].dt&=15;
-          ins->fm.op[j].d2r=reader.readC();
-          ins->fm.op[j].ssgEnv=reader.readC();
+          if (sys==3 || sys==6) { // OPLL/VRC7
+            ins->fm.op[j].ksr=reader.readC()?1:0;
+            ins->fm.op[j].vib=reader.readC();
+            if (j==0) {
+              ins->fm.opllPreset=ins->fm.op[j].vib>>4;
+            }
+            ins->fm.op[j].vib=ins->fm.op[j].vib?1:0;
+            ins->fm.op[j].ksl=reader.readC()?1:0;
+            ins->fm.op[j].ssgEnv=reader.readC();
+          } else {
+            ins->fm.op[j].rs=reader.readC();
+            ins->fm.op[j].dt=reader.readC();
+            ins->fm.op[j].dt2=ins->fm.op[j].dt>>4;
+            ins->fm.op[j].dt&=15;
+            ins->fm.op[j].d2r=reader.readC();
+            ins->fm.op[j].ssgEnv=reader.readC();
+          }
         }
       }
     } else { // STD