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The Rose and midi connexion
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An adapter cable won't work. You'll need a midi box along the lines of https://www.disasterareaamps.com/shop/midibox
These cables work with Empress pedals so I thought it would be ok with the Rose.
https://empresseffects.com/products/midi-to-1-4-cables
What is happening in these little MIDI boxes that these adapters can't do ?
I am also curious.
i find it hard to believe one couldn't build an adapter cable..MIDI is not complicated. But I have no idea what is up with the Rose's EXP jack.
SO what is up? How does it know it is MIDI coming and not an AUX switch or EXP pedal?
Short answer: Opto-isolation and conversion to a voltage signal.
I've bought a few of those cables to confirm if they work. We usually require one of the boxes because DIN MIDI is specified as current-mode, designed to light an LED in an opto-isolator. It is less complex electronically to share the jack between aux switches, expression pedal and a MIDI option if we can receive it as a voltage signal. Of course, in the year since we released the Rose, things have transitioned to using adapter cables like the one mentioned.
The Rose knows if MIDI is coming in (relative to an aux switch or an exp pedal) because you set it that way: https://www.youtube.com/watch?v=5hjxynHnV2E