Tempo synced Delay Plugin

I have been working on a native delay plugin. It makes use of the TempoSycnKnob for both the delay time, and the lfo time.

first pull request ever !!! please let me know if I have done anything  wrong..
why do you call setAmplitude from inside the frame loop? It doesn't change during the period, so just call it once before the loop... same for setFrequency