Limit on mixing WAV files?

Hello.

I have a teensy 4.0 and audio board. In my project I want to mix some sound effect WAV files together.

Before I get carried away I just wanted to ask how many WAV files can I play from the onboard SD card simultaneously?

I can see the mixer has 4 channels but I seem to recall reading somewhere when I was researching that I can only play two WAV's simultaneously if accessing them off the SD card.

Thanks.
 
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