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to move the SD Card’s chip select change SFEMP3ShieldConfig.h line 168 to the pin of your choice. Or create a #ifdef to match your circuit.

Whereas, to use other timers does not necessarily prohibit the use of their associated pins for GPIO. The pins are free for other use, unless the timer is configured to be used as its timer function e.g. Generate either a Output Compare or PWM or Input Capture.

Note that the example libraries behavior can be configured to use Timer1 library, in place of Interrupt’s, without changing the pins. by changing SFEMP3ShieldConfig.h line 195