Justus Kandzi has introduced Monotone Delay, a ribbon synthesizer app for iOS.
It consists of three main parts: a frequency modulating LFO, a lowpass filter and a delay.
The waveform of the LFO can be changed between a triangle wave and a square wave with the switch on the left. The knob labeled rate controls the frequency of the LFO, the knob labeled int controls the intensity of the frequency modulation.
The knob in the middle controls the cutoff position of the lowpass filter.
The delay can be manipulated by the two rightmost knobs. The one labeled time sets the time between the original and the delayed signal and the other one, labeled feedb controls how much of the original signal is fed back to the delay.
The monotone delay synth for iOS is available to purchase for $0.99 USD.
More information: Justus Kandzi