I have a strong doubt … looking at the pins of the sound card … I see that it is connected to SDA1 and SCL1 … doesn’t it conflict with the expansion?
No i2c interface can be shared by many devices. Just be sure they do not share the same adress.
Exemple : you can use up to 8 mcp23008 by configuring A0, A1, A2 pins at high or low level (<=> 8 combinations).
Your mcp23008 is adress 0x20
Your DAC is adress dx40 (UU means the device is in use)
thanks for the clear answer … I think I’ll take a break … 
Guys, thank you for the infinite patience … the problem was a faulty encoder (D) … not knowing what to do anymore, I replaced it and IT WORKS !!!
This is my final configuration … now I will not touch this instrument again for a week … and then… 
Congratulations!
So you moved all your switches onto the MCP23008? Every one comes up with something different!
Pictures are always interesting and sounds are even better !
It’s not closed yet, but here is my baby. I printed the case with a 3D printer and designed it myself. As soon as it is closed and working I will put an audio file. In the meantime, thank you for your precious help.
This is the “fast” studio station … but then the Zynthian will go to my home recording studio.
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It should work.
Both in and out? Or do I need to configure something?
What do you want to send to MIDI output?
In webconf INTERFACE->MIDI Options you can select which ports are enabled. (MIDI Ports, near the bottom of the page. Press the ‘+’.) There is also an option on that page to enable / disable routing MIDI to output ports.
Many thanks Riban…
There are some things that still don’t work even if they interest me relatively … For example I tried to use the record to attach an audio file … I think it doesn’t work …
I think I will buy 4 better quality encoders because these Chinese are short-lived … Already the D has made me lose days of work and messages on this forum (disturbing you guardian angels) … and now the C is starting to fail. … Anyway, apart from a few gadgets, everything works wonderfully … Thanks to all of you
I recorded some chords of a piece by Pino Daniele with MixBus and I converted it into the format…
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Thanks for the hearts … I don’t record midi, I’ve always recorded audio … that’s why I know very little about midi. In midi I record only with KontaKt and all the virtual instruments, but I rarely modify the track … if I’m wrong, I’ll do it again (all school)
Thanks
I think I need to modify a usb / microusb cable and turn off the power … this is because when I connect it to the MacBook to use Zynthian’s MIDI, I hear loud noises of electric current …
Then I’m thinking about inserting this shield … if I have the courage …
I tried to record a piano (don’t listen to the notes I make … they are thrown there to try …) Unfortunately, despite a beautiful sound, it is not usable as there are interruptions when the sustain pedal is used a lot. …
The Pianoforte is SFZ Salamander Grand Piano
The multiplexer for my minimal Zynthian should arrive today… I have doubts… I have to connect the encoders but I see 8 SC and 8 SD this is due to the fact that this card has two addresses (selectable I2C address: 0x70-0x77) or for what other reason?
Thanks for any info
Zynthian is not designed to work with an I2C multiplexer. This unit is hardware configured using A0-A2 to define what address it responds to. Writing to that address will configure it to pass and further I2C messages to the corresponding I2C pet on the multiplexer.
That schematic shows a MPC23008 which is an I2C GPI interface. The module you showed earlier uses a TCA9458A which is an I2C multiplexer. They are very different devices.
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Thanks… then I was wrong to order the chip… Now I have to reorder it and wait another month… 
Can the CD74HC4067 fit?
I remembered that the multiplexer I bought is the same as the ones used with Arduino in my MiniMoog…
What problem are you trying to solve?