diff --git a/.gitea/build.sh b/.gitea/build.sh
deleted file mode 100755
index 35786a8..0000000
--- a/.gitea/build.sh
+++ /dev/null
@@ -1,46 +0,0 @@
-#! /bin/sh
-
-set -e
-
-log () {
-  echo "=== $*"
-}
-
-# Make sure we're in the project directory
-cd $(dirname $0)/..
-
-mkdir -p out/
-
-while read variant vid pid flags; do
-  log
-  log "Building $variant ($vid:$pid)"
-  log
-
-  # We can overload build.extra_flags from boards.txt,
-  # so just specify the -D flags to gcc
-  flags="$flags -DUSB_VID=$vid -DUSB_PID=$pid"
-  flags="$flags -DUSB_MANUFACTURER=\"woozle.org\""
-  flags="$flags \"-DUSB_PRODUCT=\"Mockband $variant\"\""  # wtf quoting
-  flags="$flags -DCDC_DISABLED"
-
-  # Arduino gets cranky when it tries to use its own cache
-  rm -rf build/
-  mkdir -p build/cache/
-
-  arduino-builder \
-    -build-path $(pwd)/build/ \
-    -build-cache $(pwd)/build/cache/ \
-    -fqbn arduino:avr:leonardo \
-    -hardware /usr/share/arduino/hardware \
-    -tools /usr/share/arduino/tools \
-    -prefs="build.extra_flags=$flags" \
-    -compile MockBand.ino
-
-  mv build/MockBand.ino.hex out/MockBand.$variant.hex
-done << EOD
-guitar       0x1bad 0x0004
-guitar-wammy 0x1bad 0x0004 -DWAMMY
-drums        0x1bad 0x3110
-EOD
-
-ls -l out/
diff --git a/.gitea/publish.sh b/.gitea/publish.sh
index efcbbc3..836d821 100755
--- a/.gitea/publish.sh
+++ b/.gitea/publish.sh
@@ -7,9 +7,15 @@ VERSION=$GITHUB_REF_NAME
 
 BASE=$GITHUB_SERVER_URL/api/packages/$GITHUB_ACTOR/generic/$PACKAGE/$VERSION
 
+curl \
+  --user "$GITHUB_ACTOR:$PACKAGE_API_TOKEN" \
+  --request DELETE \
+  $BASE
+
 for path in "$@"; do
   fn=$(basename "$path")
   echo "=== Upload $VERSION/$fn"
+
   curl \
     --user "$GITHUB_ACTOR:$PACKAGE_API_TOKEN" \
     --request DELETE \
diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 7774179..3d8958d 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -9,9 +9,11 @@ jobs:
     steps:
       - name: check out repository
         run: git clone -b $GITHUB_REF_NAME $GITHUB_SERVER_URL/$GITHUB_REPOSITORY .
-      - name: build
-        run: .gitea/build.sh
+      - name: build firmwares
+        run: make
+      - name: build zip file
+        run: make dist
       - name: publish
         env:
           PACKAGE_API_TOKEN: ${{ secrets.PACKAGE_API_TOKEN }}
-        run: .gitea/publish.sh out/*
+        run: .gitea/publish.sh build/*.zip build/*.hex
diff --git a/.gitignore b/.gitignore
index 7ebfec5..a97d760 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 *.zip
 *.hex
+build/
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..6129671
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,49 @@
+DEVICE=/dev/ttyACM0
+
+all: firmwares
+
+firmwares: build/MockBand.guitar-wammy.hex
+build/MockBand.guitar-wammy.hex: VID=0x1bad
+build/MockBand.guitar-wammy.hex: PID=0x0004
+build/MockBand.guitar-wammy.hex: FLAGS=-DWAMMY
+
+firmwares: build/MockBand.guitar.hex
+build/MockBand.guitar.hex: VID=0x1bad
+build/MockBand.guitar.hex: PID=0x0004
+
+firmwares: build/MockBand.drums.hex
+build/MockBand.drums.hex: VID=0x1bad
+build/MockBand.drums.hex: PID=0x3110
+
+firmwares: build/MockBand.drums1.hex
+build/MockBand.drums1.hex: VID=0x1bad
+build/MockBand.drums1.hex: PID=00005
+
+
+build/MockBand.%.hex: MockBand.ino
+	mkdir -p build/cache
+	rm -f build/build.options.json
+	arduino-builder \
+		-build-path $(abspath build/) \
+		-build-cache $(abspath build/cache/) \
+		-fqbn arduino:avr:leonardo \
+		-hardware /usr/share/arduino/hardware/ \
+		-tools /usr/share/arduino/tools/ \
+		-prefs="build.extra_flags=-DUSB_VID=$(VID) -DUSB_PID=$(PID) '-DUSB_PRODUCT=\"Mockband $*\"' -DUSB_MANUFACTURER=\"woozle.org\" -DCDC_DISABLED $(FLAGS)" \
+		-compile $<
+	mv build/MockBand.ino.hex $@
+
+
+flash-%: build/MockBand.%.hex
+	echo -n "Waiting for $(DEVICE)..."; while [ ! -e $(DEVICE) ]; do echo -n .; sleep 1; done
+	avrdude -v -patmega32u4 -cavr109 -P$(DEVICE) -b57600 -D -Uflash:w:$<:i
+
+dist: build/MockBand.zip
+
+build/MockBand.zip: firmwares
+	rm -f $@
+	zip -r $@ README.md build/*.hex docs/
+
+clean:
+	rm -rf build
+
diff --git a/MockBand.ino b/MockBand.ino
index 8373f36..8794bd6 100644
--- a/MockBand.ino
+++ b/MockBand.ino
@@ -142,8 +142,8 @@ void loop() {
     }
 #else // DRUMS
     buttonState.buttons |= (buttons >> 10) & 0b01011;   // Cymbals
-    bitWrite(buttonState.buttons, 10, buttons & (0b01111 <<  0));  // Drum pad modifier
-    bitWrite(buttonState.buttons, 11, buttons & (0b01011 << 10));  // Cymbals modifier
+    bitWrite(buttonState.buttons, 10, (buttons >>  0) & 0b01111);  // Drum pad modifier
+    bitWrite(buttonState.buttons, 11, (buttons >> 10) & 0b01011);  // Cymbals modifier
     buttonState.axis[3] = bitRead(buttons, 12)?255:0;   // High hat
 
     // rbdrum2midi wants these set
@@ -151,6 +151,9 @@ void loop() {
     buttonState.velocity[1] = bitRead(buttonState.buttons, 2)?127:0; // R 
     buttonState.velocity[2] = bitRead(buttonState.buttons, 1)?127:0; // G
     buttonState.velocity[3] = bitRead(buttonState.buttons, 0)?127:0; // B
+
+    // Say the D-pad is centered
+    buttonState.hatAndConstant = 8;
 #endif
 
 #ifdef DPAD
diff --git a/docs/tech-notes.md b/docs/tech-notes.md
index fb48ec5..27a7d43 100644
--- a/docs/tech-notes.md
+++ b/docs/tech-notes.md
@@ -70,13 +70,19 @@ Here's what each bit means:
 hatAndConstant
 --------------
 
-Here's what the values mean:
+The HAT switch reports its position like a clock.
 
-* 2: right
-* 6: left
-* 0: up
-* 4: down
-* 8: nothing
+    7   0   1
+
+    6   8   2
+
+    5   4   3
+
+0 is up,
+2 is right,
+4 is down,
+6 is left,
+and 8 is centered.
 
 
 velocity