diff --git a/midi2osc/LV3 b/midi2osc/LV3
new file mode 100644
index 0000000..262eb56
--- /dev/null
+++ b/midi2osc/LV3
@@ -0,0 +1,106 @@
+# Mappings for Faderfox LV3
+#
+# These mappings translate all controls of an LV3 with factory settings to
+# channel 0. To do a factory reset, do this:
+#
+# - press and hold FX and Master for one second, until the LED above Shift
+#   turns yello
+# - press FX1 and FX2 together (near the joystick)
+# - press and hold FX and Master until the yellow LED turns off
+# - the LV3 will reset within a few seconds
+#
+
+#
+# "Radio" buttons change the LED assignment and only emit a 127 for the
+# function that's been activated, but never a 0. Pressing a button that's
+# already on repeats it.
+#
+# The radio buttons also affect the channel the rotary decoders use.
+#
+
+c.24=c0.1	# Rotary encoders, turn, differential (without decay)
+c.25=c0.2
+c.26=c0.3
+c.27=c0.4
+c.28=c0.5	# Rotary encoders, push, toggle (with LED)
+c.29=c0.6	# if shifted, push, tact (127/0)
+c.30=c0.7
+c.31=c0.8
+c8.8=c0.9=8	# FX, push when off, radio (LED on)
+c9.8=c0.9=9	# FX, push when on, radio (LED blinking)
+c10.8=c0.9=10	# Master, push, radio (LED on)
+c0.8=c0.9=0	# Black, push, buttons, radio
+c1.8=c0.9=1
+c2.8=c0.9=2
+c3.8=c0.9=3
+c4.8=c0.9=4
+c5.8=c0.9=5
+c6.8=c0.9=6
+c7.8=c0.9=7
+c0.22=c0.10	# Black + Shift, push, toggle (with LED)
+c1.22=c0.11
+c2.22=c0.12
+c3.22=c0.13
+c4.22=c0.14
+c5.22=c0.15
+c6.22=c0.16
+c7.22=c0.17
+# c0.18, c0.19 unused
+c0.7=c0.20	# Faders
+c1.7=c0.21
+c2.7=c0.22
+c3.7=c0.23
+c4.7=c0.24
+c5.7=c0.25
+c6.7=c0.26
+c7.7=c0.27
+# c0.28, c0.29 unused
+c0.16=c0.30	# Green buttons, push, tact (127/0)
+c1.16=c0.31
+c2.16=c0.32
+c3.16=c0.33
+c4.16=c0.34
+c5.16=c0.35
+c6.16=c0.36
+c7.16=c0.37
+c0.17=c0.38=0	# Blue buttons, push, tact (127 only)
+c1.17=c0.38=1	# since we don't have pulsed buttons (yet), treat them as radio
+c2.17=c0.38=2
+c3.17=c0.38=3
+c4.17=c0.38=4
+c5.17=c0.38=5
+c6.17=c0.38=6
+c7.17=c0.38=7
+# c0.39 unused
+c0.18=c0.40	# Green + Shift, push, toggle (with LED)
+c1.18=c0.41
+c2.18=c0.42
+c3.18=c0.43
+c4.18=c0.44
+c5.18=c0.45
+c6.18=c0.47
+c7.18=c0.48
+# c0.48, c0.49 unused
+c8.1=c0.50	# Left joystick, X
+c8.2=c0.51	# Left joystick, Y
+c8.4=c0.52	# FX1, push, toggle (with LED)
+c8.5=c0.53	# FX1 + Shift, push, toggle (with LED)
+# c0.54 unused
+c9.1=c0.55	# Right joystick, X
+c9.2=c0.56	# Right joystick, Y
+c9.4=c0.57	# FX2, push, toggle (with LED)
+c9.5=c0.58	# FX2 + Shift, push, toggle (with LED)
+# c0.59 unused
+c10.6=c0.60	# Scene, turn, differential (no decay)
+c11.9=c0.61	# Scene + Shift
+c10.3=c0.6	# Scene, push, tact (127/0)
+# c10.0 is Scene + Shift, push, tact (127 only)
+
+#
+# MIDI In controls:
+#
+# c0.6			Scene display (0-99)
+# c0.16 through c7.16	LEDs green buttons (0, non-zero)
+# c0.17 through c7.17	LEDs blue buttons (0, non-zero)
+# ...
+#
diff --git a/midi2osc/README b/midi2osc/README
index d39373e..ae11538 100644
--- a/midi2osc/README
+++ b/midi2osc/README
@@ -1,3 +1,6 @@
+midi2osc - MIDI to OSC forwarder
+================================
+
 midi2osc register itself as a writeable MIDI device. It then forwards
 the MIDI messages it receives to the specified OSC destination.
 
@@ -10,6 +13,10 @@ Compilation:
 
 make
 
+
+Usage
+-----
+
 To use it with the Milkymist One,
 
 - enable Ethernet on the M1
@@ -36,3 +43,12 @@ a host called "m1".
 If <value> is given, that value will be assigned for any control
 message that matches the input pattern, irrespective of the input
 value.
+
+
+File-based mappings
+-------------------
+
+To load mappings from a file containing #-style comments, the
+following invocation can be used:
+
+midi2osc `sed 's/#.*//' filename` ...