message: synth_waveform_f32: add get/set for frequency and amplitude
diff: @@ -141,6 +141,12 @@ class AudioSynthWaveform_F32 : public AudioStream_F32
  void setAudioBlockSamples(const int _audio_block_samples) {
  audio_block_samples = _audio_block_samples;
  }
  + float getFrequency_Hz(void) { return _Frequency; }
  + float setFrequency_Hz(float _freq_Hz) { frequency(_freq_Hz); return getFrequency_Hz(); }
  + float getAmplitude(void) { return _magnitude; }
  + float setAmplitude(float amp) { amplitude(amp); return getAmplitude(); }
  +
  +
  private:
  inline float32_t applyMod(uint32_t sample, audio_block_f32_t *lfo);
  const float32_t _PI;
  