(B-Stock) Electro Harmonix Q-Tron Plus envelope filter with effects loop

The Q-Tron Plus - Electro Harmonix's filter effect pedal - helps your sound cut through the mix and allows you to enhance certain frequencies. Filter effect Filter effects change the frequency contents of an audio signal, by boosting or attenuating certain frequencies or frequency ranges. That sounds complicated, but the Q-Tron Plus envelope filter is a pleasure to work with. When you're getting your funk on, it's great to boost the trebles of your guitar sound, adding some body to your licks. The Q-Tron is capable of doing just that, and can even add some extras that you wouldn't be able to realise without a filter. Operation Q-Tron+ Using the six knobs and single switch of the Q-Tron Plus, you can produce any desired result. The filter effect is suitable for guitar, bass guitar and even keyboard. An earlier version of the Q-Tron did not have an Effects Loop and Attack Response switch - features that allow you to take things to another level when you combine them with other effect ped