Add two simple examples for the new pass-through option.

examples/XTouchONE.midizaprc

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+
+# The X-Touch ONE is quite capable as it is, it just lacks a SHIFT key.
+# The sole purpose of this utterly trivial config is to provide one.
+
+# Copyright (c) 2018 Albert Graef <aggraef@gmail.com>
+
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and
+# this notice are preserved.  This file is offered as-is, without any
+# warranty.
+
+JACK_NAME "midizap-XTouchONE"
+JACK_PORTS 2
+
+# Pass everything through, except for the one mapping below.
+PASSTHROUGH
+SYSTEM_PASSTHROUGH
+
+# NOTE: This assumes that you use the default Mackie mode of the ONE.
+# Otherwise you'll have to adjust the key mapping accordingly. I use the
+# SCRUB key as a replacement (F8 in MC mode), because Ardour doesn't use
+# it. If you do need that key, use another one that you can spare.
+
+[MIDI]
+F8 A#5
+
+[MIDI2]
+A#5 F8

examples/nanoKONTROL2.midizaprc

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+
+# The nanoKONTROL2 has no plain Mackie emulation. Its Cubase mode comes close,
+# except for the MARKER keys. This config patches them up a bit so that they
+# do something useful.
+
+# Copyright (c) 2018 Albert Graef <aggraef@gmail.com>
+
+# Copying and distribution of this file, with or without modification, are
+# permitted in any medium without royalty provided the copyright notice and
+# this notice are preserved.  This file is offered as-is, without any
+# warranty.
+
+JACK_NAME "midizap-nanoKONTROL2"
+JACK_PORTS 2
+
+# Pass everything through (including feedback), except for the mappings below.
+PASSTHROUGH
+SYSTEM_PASSTHROUGH
+
+# NOTE: This assumes that you run the nanoKONTROL2 in Cubase mode.
+
+[MIDI]
+
+F7  C7   # "SET" -> MARKER
+
+# AFAICT, the "Prev/Next Marker" functions have no standard representation in
+# MCP. In Ardour, they can be accessed with the Q and W keys, but we don't
+# want to depend on "real" keyboard bindings here. Instead, we assume that you
+# have bound these operations to some MCP function keys in your DAW. The
+# bindings below use the shifted cursor keys, but you can use whatever is
+# convenient.
+
+E7  A#5 D8  # SHIFT <-
+F#7 A#5 D#8 # SHIFT ->