To not to dilute the thread about the cases
for Axoloti, I'm opening this topic to answer some questions about Morpheo
More info can be found in the MIDIBox forum thread
Sorry for replying so late.
STM32F4 runs ported Goom synth. 16 note polyphonic, 16 voice multi-timbral synth, open source. Benefit of using STM32F4 is that it has all the hardware needed on board (DAC, USB, ...) so just flashing the firmware and routing MIDI over USB to it makes it immediately functional synth. But it needs a control surface to set at least basic parameters to hear any sound. At default all params are at zero after boot. So I created a Pure Data control surface which is specifically optimized for original Raspberry Pi 800x480 touch screen display to be run in fullscreen. This PD patch can store a library of sounds (16 banks by 16 sounds, comes with 64 sounds), it allows you to edit individual MIDI channel sounds and has a morphing feature controlled by ModWheel (only in currently edited channel). Cool for sound design process. See the documentation of Morpheo for full feature list.
In the latest version (not released yet) I've added basic sound loading for MPE - definable channel span can load the same sound accross several MIDI channels so you can play in Channel Per Note fashion. Still a bit buggy but it brings joy with Linnstrument already.
STM32F4 stereo output is the red circle on the front plate and if there is no jack connected to it, it is normaled to Axoloti's stereo input. With hard panned sounds on Goom I can get two mono inputs into Axo and process them separately.
I didn't manage to run the Axoloti Patcher on RPi. It would be cool to control it from there so if anyone finds how to do that (ported Patcher for ARM), please, share it. TBH I didn't spent much time trying it and I just edit it from a laptop.
Next step will be to design some easy, yet flexible two channels FX patches in Axo and make appropriate PD control surface for them as well. As of now I'm running just a reverb patch to add some ambience to Goom sounds.
As of now, I'm not running Axo Patcher on RPi (see above), only PD remote control and even that is far from being finished.
For the software audio I've put PiDAC+ inside Morpheo (audio female jacks on the left side of Morpheo) which comes with pre-optimized Raspbian - RT kernel, JACK, qJackCtl is all there. Then I just installed additional software from repos.
RPi is booting into OS so I can choose what to do each time. Like a normal computer. I start SunVox into normal windowed mode but switch to fullscreen with Alt+F11 as with nearly all other apps. That way I can Alt+Tab into other running apps. Actually SunVox is one of the best apps to run even on low-res screens thanks to it's DPI and sizing settings. No multi-touch though (only Android and iOS AFAIK).
Edit: Added Morpheo file.
IMPORTANT: Rename it to Morpheo.zip after download, it's not an axo file. It's renamed so it can be uploaded here!!!
Morpheo.axo (109.9 KB)