Electro Harmonix Q Tron Envelope Follower Phattest, funkiest envelope filter ever! The improved Electro-Harmonix Q-Tron Envelope Filter provides all the wah sounds of the famous Mu-Tron III heard on countless funk and rock recordings, but with increased frequency response and improved signal-to-noise ratio. The Q-Tron features switchable Up/Down Filter drive; variable filter-peak control; hi/low range control; selectable LP, BP, HP and Mix filters; a variable-gain control and overload ind
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