Test_002 synth LFO has no effect

Excited about the synth stuff.
Presumably the amplitude on the LFO should be non-zero in order for it to have an effect?
```c++
		// Third oscillator acts as LFO for primary
		osc3.frequency = 5.0 / 20000.0;
		osc3.amplitude = 0.0;
```

Can you give a taster of what your plans are for the synth stuff??
