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Kastle is a mini modular synthesizer with headphone output, 2 in/out ports for interfacing other gear and it runs on just 3 AA batteries.
It combines complex oscillator and LFO with stepped waveform generator.
The oscillator section has 3 sound parameters pitch, timbre and waveshape – all under voltage control and with 3 different synthesis modes.
It has a main output and a square wave output. Both can be used independently or combined.
The 3 synthesis modes are phase distortion, phase modulation (also known as FM) and track & hold modulation.
Each mode utilizes two oscillators.
The Pitch controls the main oscillator, the Timbre sets the pitch of the modulating oscillator and the waveshape depends on the synthesis mode.
The waveshape also controls the pulse width of the square wave output from the main oscillator.
The voltage controllable LFO has a triangle and square output and a reset input.
The stepped waveform generator is inspired by the Rungler circuit by Rob Hordijk.
It can produce 8 different voltages either in random order or in 8 or 16 step looping patterns depending on how the BIT IN is patched.
- complex oscillator
- 3 synthesis modes: phase distortion, phase modulation and track & hold modulation
- voltage controllable LFO with triangle and square outputs and reset input
- stepped voltage generator with random, 8 step and loop 16 step mode
- 3x AA battery operation with power switch