ACL(Audiophile Circuit League)QLFO 是一款 Utility 類別的 Eurorack 模組,專為調變設計,能同時產生一個正弦波與三個相位偏移的副本(0°、90°、180°、270°),並可在三段頻率範圍內運作。
Audiophile Circuit League QLFO 不令人意外地是以調變為設計核心。但出於多樣與包容的精神,它也能作為一個基礎的正弦波 VCO 運作。
QLFO 會同時產生一個正弦波與三個相位偏移的副本,分別為 90°(餘弦)、180°(反相正弦)與 270°(反相餘弦),每一個都有自己的輸出。這些波形的頻率以單一旋鈕一併控制,可在三段範圍內運作:從慢到足以在每個週期之間調出一杯像樣的碎冰雞尾酒的調變速度,一路到高到一位 50 多歲在現場演出的次中音薩克斯風手大概都聽不見的音頻。
頻率也能以電壓控制(輸入端附有 attenuverter),而另一個 CV 輸入則讓 LFO 可以用 volt/octave 定音高,在 2 至 3 個八度範圍內追蹤良好。
QLFO 設計上能與任何 Eurorack 模組設備搭配運作,但如果我們說自己沒帶著調變自家器材的夢想來打造它,那就是在說謊;這些 90° 的相位偏移,能為我們的 Dual State Variable VCF 與 Dual Delay 模組帶來一些極為有趣的調變,在處理立體聲訊號時尤其如此。撇開私心不談,它們拿來調變其他廠牌的立體聲器材也同樣出色。
而且你甚至不需要接上其他模組就能開始玩——一個有趣的可能性是,把模組的某個輸出 patch 到 Rate CV 輸入,讓你能創造出新的波形,同時仍能用 1V/Oct 輸入控制 LFO。接著,你可以透過 patch 入更多 QLFO、讓它們以音高互相調變,把這件事推到「11」(甚至更高)。這能創造出極其複雜而繁忙的聲響——甚至可達到一種近似白噪音的狀態——卻仍保有某種可辨識且最關鍵的可控特性,並能從看似混沌漂移到較為有序、可辨認的樣式……然後再次漂離。
誠然,這一切大概聽起來會比讀起來更令人驚艷,但讀起來也還挺酷的,不是嗎?此外,本著完整揭露的精神,值得一提的是,雖然 QLFO 能在音頻頻率下運作,但它並非專為此而設計,因此 V/Oct 的追蹤精準度不會像我們的 Sync VCO 那麼準確。但有時候這並不重要——有時候你只是慶幸自己手上多了一堆額外的正弦波 VCO 可以玩。再說,在過程中引入一點點鬆散的不可預測性,本身就很有意思!
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