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Just to let you know, SInce may 2020, apparently Casio did make the midi-implementation document for the CDP-S350. The document is available on the website, in the section for manuals of the CDP-S350.

I use my iPad (5th generation) on iPasOS 14.1 connected to my CDP-S350 with the chordana for piano app. Working very good...

In Macos catalina, apple stripped all the support for older (32-bit) programs, see the text hereunder I found on a website. google around for 32-bit support in macos catalina and you’ll find a lot of info. There are some possible workarounds. “Apple's latest version of macOS, 10.15 Catalina, looks a lot like earlier versions of the operating system, but is vastly different under the hood. The biggest change is that Apple ripped out all the code that, in earlier versions, made it possible to run older 32-bit apps in Apple's 64-bit operating system. Apple warned us years ago that this change was coming, and there's no doubt that an all-64-bit OS like Catalina is more efficient than an OS that runs both 32-bit and 64-bit code. Still, for many users, Catalina blocks apps that they've relied on for years.”

What is your setup? Have you installed the chordana for piano app from casio On your iPad? You’ll need that app to connect to your S100?

I like this idea, It’s a good thing to add extra or better functions to your keys. Was thinking to do this kind of thing to the buttons for variation/fill on my cdp-s350. i often miss a chord after searching for the right button while playing. A foot switch is easier to use, anyway for me. But first have to wait for the end of my warranty. So very interested to see some photo’s.

Basically you can use your cdp s350 in two ways. 1. play it as a keyboard, as addon you could control the setting of the keyboard with the casio chordana app on your phone/tablet, sound is generated in your keyboard 2. use the keyboard as a midicontroller to control a daw/vst, the sound is produced in your computer/tablet/phone. Reading your remark “want to do the reverse”, that’s not possible afaik

In theory that is possible through the audio in connection. but in the real life it will not be a great success, because there is no way to control the balance between audio in and the sound from the keyboard itself. You could try to use a little mixer/preamp, then there is a way to regulate and balance the volume of the mic to that of the keyboard. Keep us posted if you get any good results

Maybe you accidentally activated the operations lock function. But after a switch off /switch on the operations lock should be removed. it’s in the user manual

There is information about ‘general midi’ in wikipedia (https://en.m.wikipedia.org/wiki/General_MIDI) In short GM is a set of minimum requirements and therefore a GM voice is compatible and interchangeble for all manufacturers.

Usb is only for midi. For audio you need to connect a audio cable between the audio-out of your source (computer) and the audio - in connector of your ctx. i think it’s also possible to play an audio file from a flashdrive. But i’m not sure, i own a cdp-s350 not a ctx you can read more in the manual of your ctx

So here is the next step in the process of discovering the functions available on the connection on my CDP-S350 for the SP-34 pedal. This is the connector on my CDP-S350 in front view I tried three use cases, first with the SP-3 standard pedal (internal impedance 150 ohm), then with a pushbutton in series with a 100 ohm resistor, and the pushbutton directly. There was no difference in the results. Pinnr Impedance volt(open) Function SP34pedal MIDI (value) 1 1 Kohm 3 V sostenuto Middle 66 (127) 2 1 Kohm 3 V soft Left 67 (127) 3 1 Kohm 3 V sustain Right. 64 (127) 4 0 ohm 0 V common - - 5 1 Kohm 3 V ? - no midi 6 0 ohm 0 V common - - The SP-3 nor the pushbutton support half damper, so I could not confirm that in my measurements. Pins 4 and 6 are both common and interconnected, using 4 or 6 or both doesn’t change anything. I could not find any function at pin 5. It seems to have a connection to the internals because the measured impedance and open volts. But as long as Casio doesn’t release additional info like a service manual, the only way to find out more is opening up the keyboard and have a look. Perhaps I will do that when my warranty has ended, that’s January 2022. edit: perhaps this is a kind of "pedal connected" signal, for additional functions in the menu or something like that. I'll look in to that.. Anyway I now can start making my own three-pedal unit. And when I use my keyboard as a midi-controller, i can map the midi messages to other functions, like rotary with the organ sounds, that’s something that’s not available on the S350.

Good for you, you've got it working. Also many thanks for your extensive information, I'll use that later for my own little project

My 2 years warranty ends in january 2022, so don’t hold your breath But I’ll do a walkthrough or YTvideo when it’s going to happen

As soon as my CDP-S350 is out of warranty, I’m going to make a mod and make a seperate switch on the backpanel to mute the speakers. I think it’s bad for as well as the connector and even maybe the pcb to have always stick in or pull out the headphones plug. There is a switch on the connector, so that mod is not going to be that difficult

thats because you need a dedicated cable for midi over usb. One side is a usb-b male (like to a printer) the other connector is a usb-a male and that needs to go in the camera connection interface kit. you also can buy a dedicated lightning to usb-b midi cable. Search e**y for “lightning to usb midi”. i bought one there and it is working fine.