118 lines
3.5 KiB
Markdown
118 lines
3.5 KiB
Markdown
# mustang-midi-bridge
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Allow Fender Mustang series guitar amplifiers to be controlled by MIDI
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messages
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# Introduction
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The intent is to implement the published MIDI spec for the Fender
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Mustang Floor pedal with whatever extensions are necessary to expose
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features added to the 'v2' series.
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I am developing on a Ubuntu Precise desktop machine, but the code is
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routinely tested on a Raspberry Pi 'B' and Beagelbone Green to ensure
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these remain viable deployment targets. At this point I'm still
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experiencing issues with USB latency on the RPi and am currently
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recommending the BBG for real-world use.
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A special thanks to the original developer and contributors to 'PLUG',
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from whence the Mustang USB interface code is stolen.
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## For the non-techies
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I have written a Wiki page here:
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https://github.com/snhirsch/mustang-midi-bridge/wiki/Install
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that attempts to walk less technical users through the installation
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and build process on Raspberry Pi or Beaglebone. It's hard to know
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what level of detail to hit and suggestions or comments would be
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appreciated if I've omitted or glossed over something critical.
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# Status
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The Mustang Floor MIDI spec is about 99% implemented, with only the
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following exceptions:
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+ Tuner On/Off
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Will require substantial rework of the program to make this work
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reliably.
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+ Amp Bypass
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It's possible to turn the amp "off" with CC#68 0, but this mutes
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all sound rather than acting as a bypass. I don't think the combo
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amps support signal bypass, but haven't given up yet.
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+ Pedal Volume
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I'm not sure why this is needed, since all continuous controllers
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are directly accessible through CC messages. Since the FUSE
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application cannot issue these commands it will be guesswork to
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figure out the protocol - if it's even supported on the combo
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amps.
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+ FX Insert
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Not supported on the combo amps
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+ Tap Tempo
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If I can figure out how to do this from FUSE I can code it.
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I'm using USBPcap and tshark to snoop communication and plan to
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implement all features accessible from the Fender FUSE application.
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However, some targets listed in the MIDI spec (e.g. amplifier on/off,
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tuner mode) are not controllable from FUSE and it may take some time
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and luck to figure out the protocol.
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# Prerequisites
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+ For Ubuntu Precise or Debian Jessie:
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- libasound2
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- librtmidi-dev
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- libusb-1.0-0-dev
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- libjack0 (Precise)
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- libjackQ (Jessie)
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Would appreciate feedback on requirements for other distributions.
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# OS Configuration
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+ Add the id of the user who will be running the bridge to the
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'audio' and 'plugdev' groups. That user should then log out and back
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in to make the groups effective.
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+ As root, copy the file '50-mustang.rules' to /etc/udev/rules.d and
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refresh the system with 'udevadm control --reload'.
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There may be slight differences in requirements for other distributions.
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# Build
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```
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$ make opt
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```
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or
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```
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$ make debug
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```
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as appropriate
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# Run
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Both the amplifier and MIDI source should be connected first, then:
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```
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$ mustang_midi midi_port# midi_listen_channel#
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```
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NOTE: RPi and BBG are a bit fussy about enumeration of new USB
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devices. If you are not getting proper communication, quit the program
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and try replugging both the Fender amp and MIDI controller **after**
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those devices are powered up.
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NOTE2: I've had success using a passive USB hub with the single USB on
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the BBG, but YMMV since most USB<->5Pin MIDI converters draw some
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degree of bus power. A powered hub might be necessary in some
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situations.
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