Audio player - Am I on the right track?

Projects General Guidance
1

I posted a project a couple of weeks ago and people got me on the right track. So, thank you to this forum. Just before the project was completed...THE WHOLE THING CHANGED! The difference is this time I think I have a good approach going in, with really minimal coding. I just wanted to run it by everyone and see if there is a better idea than the way I am planning.

I have a project where I need six audio tracks to play simultaneously when a button is pushed. It is only about a minute in length so I am not worried about syncing issue that could happen with a longer recording. Here is my plan:
6 Arduino Nanos with SD card readers and 15 watt amplifiers going to separate speakers. Each handling its own track. One Arduino Uno that controls them all. When the button is pressed the Uno sends a signal to the Nanos to start playing. It also starts a timer so that if the button is pressed again before the music is over is doesn't just restart the track. Until the track is over it won't restart.

I might pair this down to three Nanos with the one sound track each on the right and left channel, then a separate amp for each channel as I want to have the ability to set volumes for each speaker. (I suppose I could use a nano for the control as well.)

The coding is really straight forward as I just need a simple WAV or MP3 player and the control board really only has a simple input output switch with a timer that I am sure I could figure out or find somewhere.

Does this sound like a sound approach? Is there any functionality that you think I should incorporate that I am not thinking of?

2

You haven't told us about your project- only how you envision solving it. I can think of a few ways to play synchronized sound, but how much synchronization is needed? Do they have to start exactly simultaneously, or within a few clock cycles? Will a few milliseconds be a problem?

3

If you go down the mono sound route, then as you say, you can use the left and right channels to get 2 mono tracks.

What about an Arduino Mega (4 hardware serial ports) and 3x DFPlayer Mini boards?

4

The project is just as stated, really. It is a doorbell. When someone presses the button it plays a single piece of music that is broken up into 6 different tracks that are played simultaneously on six different speakers. The arrangement of the music your hear will be based on where you are standing. The tracks need to play simultaneously but milliseconds out of sync will never be noticed.