I’ve a number of Pizeros I want to connect to my PiSound as USB midi devices.
The aim is to interface these with Sonic Pi as Robin Newman has done with his USB keyboard.
I have a Pimoroni Piano Hat on one Pizero.
I have a Pimoroni Drum Hat on a Pizero.
I have a Bare Essentials PiCap on a Pizero.
I have an RFID reader on a Pizero.
I’m using the latest Stretch 29 November 2017.
There are numerous internet tutorials showing how the Pizero can be set up as a USB OTG device and some report success with doing this for midi but I’ve not been able to get this to work.
More recently i’ve seen people using configfs composite gadget and i’m wondering if anyone has any experience of this ?
I have found this link (https://wiki.tizen.org/USB/Linux_USB_Layers/Configfs_Composite_Gadget/Usage_eq._to_g_midi.ko)
After much head-scratching with the tutorials and Stretch I came to the conclusion that they worked only when I edited the config.txt and cmdline.txt files on the RPi and when I enabled SSH through raspi-config.
Now to get a sample midi file to run on the PiZero and read by the PiSound.
After that i’ll need to get the Piano HAT doing the same.
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Good to hear you got it solved! Could you share a link or describe how you got it working? 
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