Rossum Electro-Music Trident 是一款 100% 全類比的三振盪器 VCO 模組,由 synth 先驅 Dave Rossum 設計,能開啟一整片動態音色織體的宇宙。
就最基本的層面而言,Trident 是三組精準的音訊 VCO,每一組都配備獨特多樣的控制電壓輸入。
主振盪器,也就是「Carrier」振盪器,會同時提供它的三種波形。兩組 Modulation Oscillator 各有單一輸出與一個波形選擇器。Modulation Oscillator 也具備電壓控制的 Symmetry 參數,可改變三角波輸出的工作週期,從鋸齒波過渡到三角波、再回到時間反轉的鋸齒波;它也能讓鋸齒波輸出在中間出現向上或向下的轉折,並在選擇脈波時控制脈波寬度。
雖然每一組振盪器都可依需要獨立使用,但當它們結合成一個同步的合奏時,真正的聲音魔法才會發生。
這個魔法正是我們所稱的 Zing Modulation。每一組 Modulation Oscillator 都能調變每一路 Carrier 輸出,其調變量由 Zing 參數控制。Zing Modulation 在數學上近似於 ring modulation,但由於振盪器之間的同步(當某振盪器的 Sync 按鈕開啟時),ring modulation 那種非諧波的和差側音便轉化為複雜卻純粹諧波的泛音頻譜,並隨著 modulation oscillator 的頻率與波形調變而動態且劇烈地變化。Modulation Oscillator 參數的每一次改變——Frequency、Symmetry、Waveshape、Zing,以及(在 Modulation Oscillator 2 的情況下)Phase——都會對三路 Carrier 波形輸出各自的音色產生不同的效果。
當 modulation oscillator 設定為追蹤 carrier 振盪器時,波形會在 carrier 頻率改變時保持不變。此時泛音結構由 modulation oscillator 的設定與 CV 調變決定。反之,若 modulation oscillator 不追蹤 carrier,部分泛音結構便會相對於 carrier 頻率而變化。
這一切意味著,無論你善用 Trident 獨特的同步調變能力(你當然應該這麼做),或只是把它當成三組出色、寬頻的類比振盪器,Trident 都能提供極為豐富多樣的戲劇性聲音織體。
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