With the STOMP-IO module, you can integrate guitar effect pedals and similar devices into your AE modular system! For output (send) and input (return) return there is a mono minijack socket; two minijack to 1/4" socket adapters are included as effect pedals usually work with the latter ones. Send and return levels can be controlled with separate knobs.

https://wiki.aemodular.com/pmwiki.php/AeManual/STOMPIO