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Sort By: Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 30 per page 60 per page 120 per page 180 per page 300 per page Page of 1 Electro-Harmonix Q-Tron Plus Envelope Filter Pedal List Price: $198.00 Our Price: $192.30 You save $5.70! Analog Man carries the Electro-Harmonix Q-Tron Envelope Filter. This new effect uses the same opto-electronic design of the Mutron-III and has an increased frequency response and an improved signal-to-noise ratio.