I've used the audio library before and had trouble when pasting the init code in another .hpp file, other than main.cpp

By init code I mean the code the audio library generates:
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

// GUItool: begin automatically generated code
AudioInputI2S            i2s2;           //xy=128,351
AudioSynthWaveformSine   sine1;          //xy=221,562
AudioMixer4              mixer1;         //xy=282,369
AudioSynthWaveformSineModulated sine_fm1;       //xy=409,553
AudioAnalyzePeak         peak1;          //xy=410,336
AudioEffectDelay         delay1;         //xy=603,418
AudioEffectFreeverb      freeverb1;      //xy=720,280
AudioMixer4              mixer2;         //xy=918,300
AudioOutputI2S           i2s1;           //xy=1102,294
AudioOutputUSB           usb1;           //xy=1108,353
AudioConnection          patchCord1(i2s2, 0, mixer1, 0);
AudioConnection          patchCord2(i2s2, 1, mixer1, 1);
AudioConnection          patchCord3(sine1, delay1);
AudioConnection          patchCord4(mixer1, peak1);
AudioConnection          patchCord5(sine_fm1, delay1);
AudioConnection          patchCord6(delay1, 0, freeverb1, 0);
AudioConnection          patchCord7(delay1, 0, mixer2, 1);
AudioConnection          patchCord8(freeverb1, 0, mixer2, 0);
AudioConnection          patchCord9(mixer2, 0, i2s1, 0);
AudioConnection          patchCord10(mixer2, 0, i2s1, 1);
AudioConnection          patchCord11(mixer2, 0, usb1, 0);
AudioConnection          patchCord12(mixer2, 0, usb1, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=136,157
// GUItool: end automatically generated code
I'd rather put it in a separate audioController.hpp file and use it in audioController.cpp as to organise my project well.
Last time I've fixed this by passing pointers of all audio instances into the constructor of the audioController.
Now before starting to work on the audio part of this rather large project I wonder if anyone else has come across this and maybe has a solution for it.
Thanks in advance