{"product_id":"zerosum-inertia-zi54","title":"Zerosum Inertia - ZI54 [Metasonix]","description":"\u003cp\u003eZerosum Inertia - ZI54\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003ciframe width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/l_EihajXyNk?si=5V3X1YrcNdmfVBh1\" title=\"YouTube video player\"\u003e\u003c\/iframe\u003e\u003cbr\u003eThis is the r54 mkii. Originally produced by metasonix with permission granted to zerosum inertia to put back into production and make available once again.\u003cbr\u003ethe circuit design is based on the wien bridge circuit created by max wien.\u003cbr\u003emetasonix applied that concept along with ideas of his own to create an experimental musical instrument for eurorack modular synthesizers.\u003cbr\u003ethe best way to describe the function of the 54 is an audio processor that can also be a sound generator.\u003cbr\u003ewhen used as an audio processor it can be used as a bandpass filter and distortion device.\u003cbr\u003ewhen the resonance is at about 10 o clock it will oscillate to become a sound generator and add resonant squeal to the filter frequency.\u003cbr\u003ethis version has the feedback loop and cv for the drive control.\u003cbr\u003ein this version, when the switch is in the upward position pointing north that routes the output of the 54 back into the freq cv which creates instability and more gain. think of it as a color switch or a wild card.\u003cbr\u003e\u003cbr\u003ethe drive cv is there to add choppy amplitude modulation.\u003cbr\u003ethis input feeds control voltage into the grid of the 6ak5\/5654 pentode and is done with the tube and sounds different on every unit due to the unique nature of the vacuum tube.\u003cbr\u003ethis cv input is unlike any other vca you have encountered and is not meant to be a precise voltage controlled amplifier. it is there to add rhythmic amplitude modulation and trem effects.\u003cbr\u003ethere are no exponential converter chips or otas used.\u003cbr\u003e\u003cbr\u003ethe freq cv is done with a 5c3\/2 vactrol and does the classic splats and bonks when fed a sharp snappy plucky envelope.\u003cbr\u003eit is best to use a modulator with a variable curve and onboard processing to dial in the best curve and behavior of the modulation.\u003cbr\u003evcs and maths works very well with this circuit and all other vactrol based cv circuits.\u003cbr\u003ehitting this with creative rhythmic pulses creates the classic lazer zaps and liquidy bubbley goopy sounds found in electronic music classics.\u003cbr\u003evactrol cv is a slewed unique indescribable experience for the experimental musician.\u003cbr\u003e\u003cbr\u003ethe sound is all coming from a 19kg8 and 6ak5\/5654.\u003cbr\u003ethe 19kg8 is a tube containing a triode and a pentode which is where the filtering and oscillation happens.\u003cbr\u003ethis tube is responsible for the freq and res controls.\u003cbr\u003ethe 6ak5 or 5654 which is the miltary version of the 6ak5 is responsible for the clipping and overdrive and amplification effects.\u003cbr\u003e\u003cbr\u003erecommended starting positions for the knobs are with freq at about 2 o'clock, res at about 10 o'clock, drive and output at about 3 o'clockand the toggle switch down\/south.\u003cbr\u003eslowly turn the the freq knob then slowly turn the res knob to get a feel of how they interact with eachother.\u003cbr\u003ethen increase the drive knob and ovserve how the foldover and clipping distortion.\u003cbr\u003enow flip the switch up\/north and observe how much the sound changes when turning the drive and out level knobs.\u003cbr\u003e\u003cbr\u003ethis module requires 400 ma of + and - 12v.\u003cbr\u003emake sure you have a high quality power supply and are leaving headroom and not using it to the full capacity.\u003cbr\u003elinear power supplies are recommended and what the module has been tested and used with.\u003cbr\u003e22hp wide.\u003cbr\u003e33mm rear depth.\u003c\/span\u003e\u003c\/p\u003e","brand":"Zerosum Inertia","offers":[{"title":"Default Title","offer_id":46632164491434,"sku":"","price":525.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0020\/5199\/7743\/files\/Zi54_8f2c66bb-98fb-48a2-9958-9725906d638a.jpg?v=1761350230","url":"https:\/\/www.noisebug.net\/products\/zerosum-inertia-zi54","provider":"Noisebug","version":"1.0","type":"link"}