Try supporting back to version 26.

colorchord2/android/AndroidManifest.xml

@@ -1,12 +1,15 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <manifest xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android" package="org.cnlohr.colorchord" 
-          android:versionCode="5">
+          android:versionCode="6">
+
+	<uses-sdk android:minSdkVersion="26"
+          android:targetSdkVersion="28" />
 
     <uses-permission android:name="android.permission.SET_RELEASE_APP"/>
     <uses-permission android:name="android.permission.RECORD_AUDIO"/>
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
 
-    <application android:debuggable="false" android:hasCode="false" android:label="colorchord"  tools:replace="android:icon,android:theme,android:allowBackup,label" android:icon="@mipmap/icon" android:requestLegacyExternalStorage="true">
+    <application android:debuggable="false" android:hasCode="false" android:label="colorchord"  tools:replace="android:icon,android:theme,android:allowBackup,label" android:icon="@mipmap/icon"  > <!--android:requestLegacyExternalStorage="true" Not needed til Android 29 -->
         <activity android:configChanges="keyboardHidden|orientation" android:label="colorchord" android:name="android.app.NativeActivity">
 
 			<!-- This device filter seems to do nothing at all! If you figure out how to use it or what it does, let me know!! -->

colorchord2/android/Makefile

@@ -7,7 +7,7 @@ CFLAGS:=-I. -I.. -Irawdrawandroid/rawdraw -I../cnfa -I../../embeddedcommon \
 	-ffunction-sections -Os -s -DPRINTF_NO_OVERRIDDE -fvisibility=hidden  \
 	-DRDALOGFNCB=example_log_function
 
-#ANDROIDVERSION=24
+ANDROIDVERSION=28
 
 LDFLAGS:=-s -lOpenSLES
 

colorchord2/android/rawdrawandroid

@@ -1 +1 @@
-Subproject commit c9700f455e17ff3db9bb509c3f4cb54edfff81b0
+Subproject commit d2e62b7ff7dcb317f7a298ea788bdbac4c7b81a1