One low budget scheme to remote select snapshots, etc. during a performance may be a simple IR Remote Control. (This is another solution for the low budget street musician)
I bought a couple of these for < $2.50 ea (Aliexpress) as a cheesie alternative to creating a phone app to configure a wearable controller device.
The transmitted codes reported in a how to article.;
The IR receiver that comes with the kit could be connected to a $5 microcomputer acting as a USB computer keyboard or MIDI device.
That could invoke available Zynthian keybinding to control the UI
The remote to keycode mapping would be done inside the microprocessor, The popular Arduino chip with built in USB (ATmega32U4) used in the Pro Micros and Leonardeo, has 1024 bytes of EEPROM which could store field programmed key or key sequence macros.
One could use a blind programming scheme like:
*# - start key programming
1 - the key being programmed
54 - the ascii code being assigned that key. (could have a variable number of key code entries)
OK - completes key programming
(I prefer to have the keybinding codes stored in a device instead if having to remember what action a computer key invokes)
This how to article gives a table of the IR codes sent by this not as generic remote you can find. (Searching for HX1838, the IR receiver part#, turns up these remote kits)
Here’s another how to article that shows how to capture the codes a remote generates.
(You can probably find the transmitted codes of remotes you have around, in this database)
I find the CUIA Command UI keybinding less than ideal because it too literally mimics the context relative input actions of the UI, while a performer may want a single action like pressing of button #7 to activate preset #7. Perhaps some macro sequences can reliably end up making the right selection regardless of starting context. (It seems that you have to be watching the LCD as you make these remote actions)
Really need to more directly set the parameters that UI action sequences are setting.
IR is not the most secure control system, outside in daylight or bright stage lighting may limit range, people in the audience could conceivably mess with you if the receiver range is looking out.
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There is a NEC IR protocol decoder for Sigrok Pulseview, an open source app that works with $8 Chinese logic analyzers. (The NEC remote protocol is quite popular) They also have a MIDI
protocol decoder.
Here’s a How-to Using a Raspberry Pi Pico as a Logic Analyzer with PulseView [/quote]) on using a $4 Raspberry Pi Pico to capture signals for analysis.
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