diff --git a/src/engine/instrument.cpp b/src/engine/instrument.cpp
index cbaa10f5d..78e509046 100644
--- a/src/engine/instrument.cpp
+++ b/src/engine/instrument.cpp
@@ -1045,6 +1045,8 @@ void DivInstrument::putInsData2(SafeWriter* w, bool fui, const DivSong* song, bo
         break;
       case DIV_INS_POWERNOISE:
         break;
+      case DIV_INS_POWERNOISE_SLOPE:
+        break;
       case DIV_INS_MAX:
         break;
       case DIV_INS_NULL:
diff --git a/src/engine/instrument.h b/src/engine/instrument.h
index 6c78ad2f3..d5d62c142 100644
--- a/src/engine/instrument.h
+++ b/src/engine/instrument.h
@@ -87,6 +87,7 @@ enum DivInstrumentType: unsigned short {
   DIV_INS_C219=54,
   DIV_INS_ESFM=55,
   DIV_INS_POWERNOISE=56,
+  DIV_INS_POWERNOISE_SLOPE=57,
   DIV_INS_MAX,
   DIV_INS_NULL
 };
diff --git a/src/engine/sysDef.cpp b/src/engine/sysDef.cpp
index 5739a2312..082aa9f9d 100644
--- a/src/engine/sysDef.cpp
+++ b/src/engine/sysDef.cpp
@@ -1990,8 +1990,8 @@ void DivEngine::registerSystems() {
     "a fantasy sound chip designed by jvsTSX and The Beesh-Spweesh!\nused in the Hexheld fantasy console.",
     {"Noise 1", "Noise 2", "Noise 3", "Slope"},
     {"N1", "N2", "N3", "SL"},
-    {DIV_CH_NOISE, DIV_CH_NOISE, DIV_CH_NOISE, DIV_CH_PULSE},
-    {DIV_INS_POWERNOISE, DIV_INS_POWERNOISE, DIV_INS_POWERNOISE, DIV_INS_POWERNOISE},
+    {DIV_CH_NOISE, DIV_CH_NOISE, DIV_CH_NOISE, DIV_CH_WAVE},
+    {DIV_INS_POWERNOISE, DIV_INS_POWERNOISE, DIV_INS_POWERNOISE, DIV_INS_POWERNOISE_SLOPE},
     {},
     {
       {0x20, {DIV_CMD_POWERNOISE_COUNTER_LOAD, "20xx: Load low byte of noise channel LFSR (00 to FF) or slope channel accumulator (00 to 7F)", constVal<0>, effectVal}},
diff --git a/src/gui/guiConst.cpp b/src/gui/guiConst.cpp
index 5b58c3a99..7991ac187 100644
--- a/src/gui/guiConst.cpp
+++ b/src/gui/guiConst.cpp
@@ -176,7 +176,8 @@ const char* insTypes[DIV_INS_MAX+1][3]={
   {"C140",ICON_FA_VOLUME_UP,ICON_FUR_INS_C140},
   {"C219",ICON_FA_VOLUME_UP,ICON_FUR_INS_C219},
   {"FM (ESFM)",ICON_FA_AREA_CHART,ICON_FUR_INS_ESFM},
-  {"PowerNoise",ICON_FUR_NOISE,ICON_FUR_INS_POWERNOISE},
+  {"PowerNoise (noise)",ICON_FUR_NOISE,ICON_FUR_INS_POWERNOISE},
+  {"PowerNoise (slope)",ICON_FUR_SAW,ICON_FUR_INS_POWERNOISE},
   {NULL,ICON_FA_QUESTION,ICON_FA_QUESTION}
 };