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BASTL Instruments Kastle 1.5 Mini Modular Synthesizer

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    Description
    Kastle is a mini modular synthesizer with a headphone output, 2 in/out ports for interfacing other gear and it runs on just 3 AA batteries. It is DIY friendly and ideal for beginners in modular synthesis, but it will add some quite unique functionality to any modular synthesizer system. It delivers the fun of modular synthesis at a low cost and fits into your pocket so you can play it everywhere!

    It has a unique digital lo-fi sound and it can be melodic as well as very noisy and drony, soft or harsh. It is designed to be fun on its own but it is most powerful when combined with other modular gear.

    Kastle is an open source DIY project which runs on two Attiny 85 chips that can be reprogrammed with an Arduino (google: “programming Attiny 85 with Arduino”). One chip is dedicated to sound generation while the other one handles modulation. Several firmwares for the Attiny chips are available thru gitHub.

    The v1.5 version combines a 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 6 different synthesis modes. It has a main output and a secondary waveform output. Both can be used independently or in combination. The 3 synthesis modes available thru the main output are: phase modulation, noise mode and track & hold modulation.There are 3 more modes on the secondary OSC output: phase distortion, tonal noise mode and formant synthesis. Each mode utilizes one or two oscillators. The PITCH parameter controls the main oscillator, the TIMBRE sets the PITCH of the modulating oscillator and the WAVESHAPE depends on the synthesis mode.

    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.
    Images
    Architecture
    Type: Digital
    Synthesis: Distortion, Formant, Oscillator(s), Phase Distorion
    Oscillators
    Oscillators: 1
    Waveforms: Square, Triangle
    LFO
    LFO: 1
    LFO Parameters: Square, Triangle
    Polyphony & Tuning
    Polyphony: 1
    Timbrality: 1
    Tuning: Atonal, Standard
    Modes: Mono
    Case
    Case: Desktop
    Controls: Knobs, Switches, Modulation Pin Matrix
    Connections
    Audio Output Connections: 1/8" Phone Jack, Mono Out
    Audio Output Count: 1
    CV Ports: CV IN, CV OUT
    Power: 3xAA, USB
    Production
    Year Released: 2017
    Manuals & Documents

    Product Links
    Company Product Sites:
    [+] www.bastl-instruments.com
    Pricing
    MSRP List Price: $94 - convert
    Retail Street Price: $90 - convert
    Shopping
    YouTube Videos
    Related Synthesizers
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