Check the listing for details. ELECTRO-HARMONIX Blurst Modulated Filter. Condition: New. Listed at 189.36 USD. The Blurst modulates the sound of an instrument like an envelope filter, but instead of the filter's response being controlled by playing dynamics, it is controlled by an internal oscillator. The Blurst is a must for the adventurous player who wants to explore new sonic paths! - modulates the sound of an instrument like an envelope filter, but instead of controlling the filter by dynamics, it is controlled by an internal oscillator All of our items have a 30-day return policy without explanation. Notes, reading and software are excluded from the exchange. The General Terms and Conditions of Zoundhouse GmbH & Co. KG apply. When purchasing multiple items: Add the items to your shopping cart and select “Request total from buyer” at the top right. If you intend to buy multiple items: put them.