What does the installation do? Depending on your needs you might be better with LC and the PROP_LC: prop_shield_lowcost.html
The LC - doesn't have this:: "Teensy 3.0 & 3.1 & 3.2 have the Cortex-M4 DSP instructions which provide plenty of computational power for real-time FFT (spectrum analysis), opening up the possibility of creating advanced sound-reactive projects."
Right now you can get 'old stock' Teensy 3.0's while supply lasts for $9.50:: teensy3.html
If you only need one time buy you can get these, worst case you'd need to use T_3.2's for later replacements.