Fred Anton Corvest has released FAC Envolver, an envelope follower AUv3 for iOS. It's available in the App Store for $6.99.
Summary:
- Detection of the contour of the input signal and output of the envelope via MIDI CC.
- Suitable for any situation: sidechain (VCA), wah VCF...
- Stereo or Mono processing.
- Fine tuning of each envelope circuit; rising and falling time, depth and inverter.
- Parameterable MIDI CC number.
- Input signal can be attenuated, amplified or muted.
- Multi-waveform graph per audio channel: envelope contour layered over input signal.
- iOS Audio Unit V3 supported in compliant hosts.
FAC Envolver is available in the App Store now for $6.99.
