Given the bits for the experiments come in lower than the radio by some way would suggest leaving that radio as it is (so if things go awry it survives), and for a basic home construction maybe you could try a simple affair with a cradle for the radio holding solenoid actuators which mechanically activate the buttons on the radio (use fulcrum levers to increase the pressure a little, and control the travel to avoid breaking the radio buttons) and see if a simple amplification of the sensor output will give you enough drive and control to press the radio buttons without having to resort to a microcontroller and coding (just remember, the sensors are generally 3.3 to 5V and solenoids 12V plus, and those must never meet – so you need a Driver Module which needs its own 5V supply (DONT use the radio USB for this voltage! This 5V must come from elsewhere, such as a regulator module run from the solenoid supply.) and see if it’s stable or “chatters” (noise?, needs more screening. though I’m guessing she has recognition issues with voice driven items, but perhaps it might be worth trying voice control audio on something like an IPhone 3. but they can even BE a music player (though if the fidelity matches what you have, I would expect not, though again that is largely in the software and the parts you choose.) but from my simple projects I can say doing it that way is going to be a significant undertaking (though keep looking as someone on the forum here might just happen to have bought something suitable. It’s not a sensor I’ve used, but the microcontroller kit devices, (which are basically electronic leggo if you need an old school analogy) don’t have to work with their design microcontroller, and these systems are handy if you need to create a low investment small size electronic slave to monitor sensors and raise the alarm if something crazy happens (which is what mine was used for before I found a literally neater solution someone mass produced!). Would it be helpful to operate the internal controls by the arduino touch sensor (which comes in quite a few mechanical incarnations)?. If you are of an electronic inclination, read on, if not maybe reach out so someone locally who might be willing to help. I would hope though that you have considered just putting all the content on one large card (or perhaps have tried a standard USB memory stick?) as that would save any working on that aspect, freeing any efforts to generating an interface your sister can operate which you could maybe use elsewhere as well. Combining several cards would require a device specifically interpreting each card and presenting a table for the data in all the cards correctly, and supplying the data from the right card when requested which is more of a bizarre mis-organised RAID 0 than an interface as such! Then there’s the issue with the user’s inability to activate the controls. The problem here is each SD card presents as a serial block of data, and if you are going to change that block of data, for it to make any sense you need to have a way of resetting the controller in the radio, causing the initial reading the drive to gather the content information, and inherently start over. I think maybe you bought this and its’s not what you wanted, but unfortunately I think without getting down and dirty with the electrons your going to find attaining the device needed is difficult, but not impossible though you might need to work on the presentation if you get it working but maybe buying one is nearer impossible? If you can think of any way, with all of these special needs, of connecting more than one audio source and that is very simple to switch between them I would be most grateful. Listening to music and recorded books is one of the few things that she can to to entertain herself. My sister is blind and mentally disabled. My sister is not capable of pressing one button to deselect a flash drive and then pressing another button to select a different flash drive. Just to make it more complicated, I suspect that any button that is pushed would need to turn off the connection between it and the MP3 player to the other two flash drives. The hub would need to have buttons so she could press one and listen to one flash drive. I hoped to find a USB hub that I could connect the 3 flash drives to so that my sister could listen to content on any of the 3 flash drives. My sister is unable to disconnect one flash drive and connect another one. But, again, the MP3 player only has 1 USB port. On three flash drives I put audio files of her favorite music, audio books, and Christmas music. I bought her a very simple MP3 player The player has one USB port so that you can plug in one flash drive and play music or spoken word.
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