Thanks, Michael, that's extremely helpful! :D :D
I'm currently using a Teensy 3.6, an audio board and a nRF24L01+, and it seems that all three things together are not working quite right. I wired the RF24 to Teensy as follows:
CE -pin 28
CSN -pin 39
MOSI - pin 11
MISO - pin 12
SCK - pin 13...