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The HF-2 is combining the original signal with a delayed signal that is shifted one octave up to create a flanging effect a bit different but still similar to the BF-2. The effect is brighter and cleaner than the BF-2. The HF-2 may not be as powerful as the BF-2, but for hi frequency flanging it produces a very good result.
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В общем эффект тот же, только HF-2 звучит поярче и почище.