Looking at that information so far on this glove it seems that we are using the Rpi as a multi-channel sound delivery system. to drive small speakers to stimulate nerves on the fingers. I apologize if I have over-simplified the design.
I am making a church bell simulator and needed to play mp3 files of recorded bells with one channel per bell. I needed to use one per bell as I didn't want to lose the reverberation when playing peels.
As part of the design research I came across this very cheap device on Aliexpress called a "DY-SV17F DY-SV19R Audio Module".
It looks like a 4MByte USB memory stick to a PC which makes loading sound files in either MP3 or WAV format easy from any platform. The unit can be triggered to play from a maximum of 65535 sounds in any order with amazing ease using triggers (buttons) or serial commands. The units have a 24 bit DAC and a 5 watt amplifier and cost less than 2UKP.
Using one module per finger the cost is minimal and the wiring almost trivial with no external amplifier required. I will need to process the original 4 channel WAV files with one WAV file per module.
It would be easy to drive them from small microprocessor eg Arduino 8650 or ATTiny85. My plan is to use an ESP32 programmed with MicroPython to trigger the audio modules . One ESP32 could easily drive ten channels i.e. two hands simultaneously. The ESP32 has WiFi making over-the-air updates easy. There is also Bluetooth which could easily connect to an app in a mobile phone.
I already had some modules on order before I got involved in this glove project so will be able to assess their suitability next week.
I have created a GitHub repository called "parkinsons-glove" to share everything. I will happily put other files there for members who are not savvy with computers or GitHub.