diff --git a/chiptune_debug/NOTES b/chiptune_debug/NOTES
index dee528be..8aa50d1d 100644
--- a/chiptune_debug/NOTES
+++ b/chiptune_debug/NOTES
@@ -17,3 +17,5 @@ remove multi file (down to 973) still issue
 remove dos33 code 		still issue
 remove lz4 code			still issue
 remove interrupt driven		still issue!?
+play at 25Hz			still issue
+
diff --git a/mode7_demo/docs/figures/m7_screen1.jpg b/mode7_demo/docs/figures/m7_screen1.jpg
deleted file mode 100644
index d90ebc08..00000000
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diff --git a/mode7_demo/docs/figures/m7_screen1.png b/mode7_demo/docs/figures/m7_screen1.png
new file mode 100644
index 00000000..e1ef4e50
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diff --git a/mode7_demo/docs/figures/m7_screen2.jpg b/mode7_demo/docs/figures/m7_screen2.jpg
deleted file mode 100644
index f8d9638c..00000000
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diff --git a/mode7_demo/docs/figures/m7_screen2.png b/mode7_demo/docs/figures/m7_screen2.png
new file mode 100644
index 00000000..34455cff
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diff --git a/mode7_demo/docs/figures/m7_screen3.jpg b/mode7_demo/docs/figures/m7_screen3.jpg
deleted file mode 100644
index dd5e05cf..00000000
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diff --git a/mode7_demo/docs/figures/m7_screen3.png b/mode7_demo/docs/figures/m7_screen3.png
new file mode 100644
index 00000000..0ad75766
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diff --git a/mode7_demo/docs/figures/m7_screen4.jpg b/mode7_demo/docs/figures/m7_screen4.jpg
deleted file mode 100644
index 950e3c7c..00000000
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diff --git a/mode7_demo/docs/figures/m7_screen4.png b/mode7_demo/docs/figures/m7_screen4.png
new file mode 100644
index 00000000..32401e2d
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diff --git a/mode7_demo/docs/mode7_demo.tex b/mode7_demo/docs/mode7_demo.tex
index 4aedf774..2b2377c8 100644
--- a/mode7_demo/docs/mode7_demo.tex
+++ b/mode7_demo/docs/mode7_demo.tex
@@ -225,28 +225,28 @@ the actual Apple II (an Apple IIe platinum edition).
 
 \begin{figure}[tb]
 \begin{center}
-\includegraphics[width=\columnwidth]{figures/m7_screen1.jpg}
+\includegraphics[width=\columnwidth]{figures/m7_screen1.png}
 \caption{Bouncing ball on infinite checkerboard.\label{fig:ball}}
 \end{center}
 \end{figure}
 
 \begin{figure}[tb]
 \begin{center}
-\includegraphics[width=\columnwidth]{figures/m7_screen4.jpg}
+\includegraphics[width=\columnwidth]{figures/m7_screen4.png}
 \caption{Spaceship flying over an island.\label{fig:tb1}}
 \end{center}
 \end{figure}
 
 \begin{figure}[tb]
 \begin{center}
-\includegraphics[width=\columnwidth]{figures/m7_screen3.jpg}
+\includegraphics[width=\columnwidth]{figures/m7_screen3.png}
 \end{center}
 \caption{Spaceship with starfield.\label{fig:stars}}
 \end{figure}
 
 \begin{figure}[tb]
 \begin{center}
-\includegraphics[width=\columnwidth]{figures/m7_screen2.jpg}
+\includegraphics[width=\columnwidth]{figures/m7_screen2.png}
 \end{center}
 \caption{Rasterbars, stars, and credits.  Stealth Susie was a particularly
 well-traveled guinea pig.