For touring the Firefly may be mounted into a standard 19" rack using the optional rack mount kit. This three piece kit enables one or two Fireflies to be rack mounted in a 1RU rack space. The Radial EXTC-SA is a professional audio interface that takes a +4dB balanced line-levelsignal and converts it to a guitar-level effects loop and then re-converts it back to a +4dB balanced line-level signal. In other words, you send in a balanced signal from your recorder, adjust the loop send level that drives the pedals. Set the return level from the pedals as it comes back and send the resulting signal to your recording system.Something to think about here is how some effect pedals will reverse the polarity of the signal passing through them. When you mix a dry signal with a wet signal and one is polarity reversed, you will of course end up with cancellation. The diagram below illustrates a setup where one pedal “B” is inverting the polarity creating cancellation where two out-of-phase signals come together.
