In Dynacord devices, apart from Mon and Aux outputs, there are a number of outputs, which include the main master output, the Master B output, and the headphone output.
Aux Send Output is commonly used to capture output for an effector, power amplifier, or recorder. Of course, in some cases, this output is also used to connect active bands, which is not very common.
effect Send output (Fx Send) is an output without effects. In fact, the Fx Send has two connectors (Fx1 / Fx2) that give you the sound of sound lines without an effect.