strng Physical Modeling String Synthesizer For iOS

Developer Erik Sigth has introduced Strng – a iOS string synthesiser, inspired by the Karplus-Strong algorithm.

In Karplus-Strong synthesis, an exciter impulse – like a burst of noise – is looped through a filtered delay line. This model can be used to simulate the way sounds resonate within some types of instruments. 

With Strng, physical modeling starts with a short burst of noise that is then guided by a tuned delay buffer and string tension filter, generating plucked string-like sounds. No samples are used.

Strng is 16-voice polyphonic and can be controlled with an in-app 25 key chromatic keyboard. You can also connect a MIDI controller through USB or W\iFi.

To further shape the sound, two post-effects are available, a ping-pong stereo delay and two channel resonant filter, controlled by two LFOs.


  • String synthesis engine
  • 16 voice poliphony
  • Audiobus
  • IAA
  • Core MIDI
  • 25 multitouch keyboard
  • Save/Load
  • Gain control
  • Tune, Detune control
  • ADSR Attack/Decay/Sustain/Release
  • Noise (length, sample crush)
  • Noise pre filter
  • String tension
  • Stereo ping-pong delay
  • Two channel resonant low pass filter LFOs

strng is available now for $1.99 in the App Store.

5 thoughts on “strng Physical Modeling String Synthesizer For iOS

  1. I’m surprised nobody has commented on this yet. Erik (humbletune) has made some really cool instruments and effects for iOS, but Strng is my favorite thus far. I just used it on track – my friend played it while I dynamically controlled the sustain parameter.

    If you’re into new and different types of synthesis (Karplus-Strong falls into this category) and a simple, yet aesthetically pleasing user interface, definitely check out Strng. I’d easily pay $5 for it; for the price of two bucks,, you can’t lose.

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