"'Serial' was not declared in this scope" when used with Teensy audio library

[miakizz]

Hello!

Thanks so much for the useful library! I'm trying to use this along with the Teensy audio library, to take audio input through I2S. However, whenever I try to compile code with the "USB Type" set to "NS Gamepad", I get many errors related to Serial not being defined. For example:

control_ak4558.cpp: In member function 'void AudioControlAK4558::initConfig()':
control_ak4558.cpp:25:3: error: 'Serial' was not declared in this scope
   Serial.print("Register ");

I'm guessing this is related to the teensy not including USB serial when emulating a gamepad, however other USB types that don't include serial, such as "Audio" or "Keyboard" don't produce those errors. Maybe those other board types are spoofing the Serial class?

Any ideas would be greatly appreciated. Thanks!