Constructor:

Oscillator(RtWvOut *dac_t, std::vector <stk_note> &point, int wave);

Oscillator::Oscillator(RtWvOut *dac_t, std::vector <stk_note> &point, int wave) 
{
	dac = dac_t;
	//all_notes = note_vector;
}


int main()
{

...

vector <stk_note> noten;

noten.push_back(stk_note());

Oscillator osc(dac,noten, 0);

...
}

compiler error:

test.cpp:52: error: no matching function for call to ‘Oscillator::Oscillator(RtWvOut*&, std::vector<stk_note, std::allocator<stk_note> >&, int)’
Oscillator.h:26: note: candidates are: Oscillator::Oscillator(RtWvOut*, std::vector<Oscillator::stk_note, std::allocator<Oscillator::stk_note> >&, int)
Oscillator.h:25: note:                 Oscillator::Oscillator()
Oscillator.h:12: note:                 Oscillator::Oscillator(const Oscillator&)
make: *** [tester] Error 1