Klankwelle

Klankwelle is a modular synthesizer for iOS.

Create up to 8 synthesizers at once and control them with a built-in keyboard or a 16-part step sequencer.  Or play them with an external MIDI source.  Fine-tune your sounds with a dynamic compressor and a 10-band graphic equalizer.

Making a new synthesizer is easy: just add modules with a double-tap and wire up your architecture by dragging between connectors.  Available modules include:

OSCILLATORS 
Sine, Square, Sawtooth, Triangle, Noise, Ring

FILTERS
Lowpass, Highpass, Bandpass, Allpass, Notch, Peak, Formant

ENVELOPES
Linear, Quadratic

EFFECTS
Fuzz, Comb, Echo, Bitcrush, Auto Gain

LOW-FREQUENCY OSCILLATORS
Sine, Square, Sawtooth, Triangle, Linear Trigger

ARITHMETIC
Add, Subtract, Multiply, Convolution

FEEDBACK

CTRL

Supported MIDI messages: Note on/off (velocity sensitive), Pitch bend, control change, program change