![]() The voltage controllable LFO has a triangle and square output and a reset input. The PITCH parameter controls the main oscillator, the TIMBRE sets the PITCH of the modulating oscillator, and the WAVESHAPE depends on the synthesis mode. Each mode utilizes one or two oscillators. There are 3 more modes on the secondary OSC output: phase distortion, tonal noise mode, and formant synthesis. The 3 synthesis modes available through the main output are: phase modulation, noise mode, and track & hold modulation. Both can be used independently or in combination. It has a main output and a secondary waveform output. The oscillator section has 3 sound parameters: PITCH, TIMBRE, and WAVESHAPE – all under voltage control, offering 6 different synthesis modes. ![]() The 1.5 version combines a complex oscillator and LFO with a stepped waveform generator. Several versions of firmware for the Attiny chips are available via GitHub. One chip is dedicated to sound generation while the other handles modulation. The Kastle is an open-source DIY project which runs on two Attiny 85 chips that can be reprogrammed with an Arduino (simply Google "programming Attiny 85 with Arduino"). It was designed to be fun on its own, but it thrives the most in an ecosystem of other modular gear. The Kastle has a unique digital lo-fi sound, and it can be melodic, rhythmic, as well as very noisy and droning, soft or harsh. You’d have to be pretty hard-hearted to find no pleasure in it.” Be an operator with a pocket calculator It delivers the fun of modular at a low cost, and it fits into your pocket so you can play it anywhere.Īs Sound on Sound’s Paul Nagle summarizes Kastle in his review: “It’s a stand-alone synth, a modulation source for your modular and can live in your pocket ready to impress your friends. The device is DIY-friendly and ideal for beginners in synthesis, but it will also add unique functionality to any full-sized modular synthesizer system. It's powered by just 3 AA batteries or a regular micro USB charger, and it offers a headphone output and 2 in/out ports for interfacing other gear, be it a keyboard, a groove box, or a Eurorack synth. The Bastl Kastle is a mini modular synthesizer you can play anywhere. We've managed to pack a lot of energy and soul into a tiny box named the Kastle. Traveling light? Bastl has got you covered.
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