Votes on the top left please. 
djay supports post-fader FX, which is great. However, in hardware mixer mode this functionality becomes far less useful when the FX are always routed back into the same channel they originate from.
That routing limitation breaks one of the most common real-world use cases for post-fader effects: letting reverb or echo tails continue after the channel fader is closed.
If djay introduced a dedicated FX bus, which could be routed in the settings to a separate output pair, this problem would largely be solved.
A concrete example:
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The Allen & Heath Xone:24C provides a USB Aux input (channels 5+6).
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That input could be used perfectly as an FX return.
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Post-fader FX (reverb, echo, delay) could be sent to the FX bus instead of back into the source channel.
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Result: you close the fader, but the FX tail remains audible — exactly how DJs expect this to behave on hardware setups.
This would immediately cover one of the most common and musically important FX workflows.
For mixers that don’t have an extra USB return — or for users who don’t want to sacrifice a physical input — a simpler alternative would already work in many cases:
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Allow post-fader FX to be routed to the other deck’s channel
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In typical DJ usage, when fader 1 is closed, fader 2 is usually fully open
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The FX tail remains audible without needing a dedicated return channel
This wouldn’t be as clean as a true FX bus, and it would take a little bit extra engineering effort, but it would still solve the core problem in a very practical way.
djay already has the FX engine. Giving it a bus-based routing option would unlock workflows that many hardware DJs rely on.
