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That makes sense. I'm using the Sandisk Ultra, which looks exactly like the picture here: http://www.pjrc.com/store/teensy3_audio.html so I'm curious as to whether whoever wrote that page (I'm assuming Paul), is seeing better throughput than what I'm seeing. Should I expect chipset variations...

I just ran SdCardTest with Teensy 3.2 and the Audio Adaptor on two Sandisk SD cards, both 16gb. One is a brand new Ultra, and the other is an older version that's all black, apparently a Class 4 from the markings. The odd thing is that the non-ultra card is actually getting better performance...