Update mystery_machine.ino

I was running into two main problems prior to these changes

1 - I was using too much SRAM so strange things were happening with the program, a lot of that was fixed with the F() macro

2 - the audio amplifier I am using with my circuit can draw up to 200mA, the pro trinket can output up to 150 mA.  When the audio amplifier would kick in the trinket would reboot. For now I have removed the amplifier and am getting a new power supply to change how I power the amplifier.