You can monitor yourself singing without recording the reverb, by setting up the Reverb in the DAW as an “Effect Track”
The Reverb will be slightly latent, but this is usually fine because in the real world this time delay becomes part of the distance between the source and the reflective surfaces.

You can setup to monitor yourself through the DAW returning the Reverb signal applied in Cubase.

The amount of reverb is subjective... you can use as much as you desire (it is being applied post, or after, the recorded signal... so you are only ‘monitoring’ the reverb, not recording it). Your recorded signal is ‘dry’.

Latency is the time between ‘real-time’ (direct) and the time it takes the computer to receive, process, and output the the arriving signal.

When using the MOXF as you audio interface you have an option for Direct Monitor and you have a DAW Return.
The Direct Monitor signal will be without Reverb
The DAW Return signal will have the Reverb

You want to hear yourself direct, so direct monitor should be On
You want to hear yourself with Reverb, so you will mix in the amount with the DAW LEVEL slider

Also returning via the DAW LEVEL are the tracks you are overdubbing the vocal to... you will need to set a balance between the returning audio (including you reverb) and your voice “direct”.

As mentioned i have turned of DIrect Monitoring ON THE MOXF8 since I want to hear alone the sound from the DAW, in order to not have to outputs. THat is why I believe that the echo is due to me hearing the DAW output with some effect applied to the VOcals track, WHILE also hearing my voice directly in my ears (not from the direct to monitor output from the MOXF).

I hope you get what I mean.

Turning Direct Monitor = On is how you hear what the MOXF is sending to the DAW... this includes your vocal mic, “live”... and of course, the MOXF synthesizer.

The DAW LEVEL slider is how you hear what is coming in from Cubase, as audio. This includes the Cubase metronome, any Audio Tracks you have recorded, the output of the Effect Track, and you have the option of hearing the vocal you are recording... We don’t call this “the mic” because you are hearing the “recording” of the mic (yes, this is the ‘latent’ signal, the signal the computer has processed)... it will be several milliseconds behind the Direct Monitor signal which is listening “live” to the mic.

You will notice this doubling if you choose to monitor both audio signal paths.
To be clear, by wanting to hear reverberation, but not record it, you are opting to hear both audio signal paths.

You can Mute the Audio Track during the recording, thus eliminating the latent signal being in your headphones... but gone with it is the reverberation (that you are not recording). You must mix in just enough of this signal to give you the reverb but not enough to throw your timing off. Hopefully, your latency measures in the single digit millisecond range. The reverb will be lower in volume than your direct signal.

This “post” signal, mixed together with the direct signal you are monitoring, does not harm you recording. This doubling is not recorded, it appears only as a monitoring issue.

I must mention this (forgive me) but you should turn your monitor speakers completely down or Off. It is a very common home studio mistake to leave the monitor speakers active. If you have an open mic, it must be completely isolated from the monitor speakers, otherwise your recording WILL suffer. You will know immediately because it will have reverb and a weird quality.

Hope that helps.

If You still are interested in helping, I advice You to provide me with a solution to that spamming issue since there is nothing disturbing or provocatory at all in what I wrote and I have minimalized capital letters, although I only use them for ease of understanding and t emphasize certain important words. How come this is so extremely difficult? Without being able to write you then I have to search elsewhere for help. I write you again since I don't find common ground for understanding regarding the help you provided. I think we might be talking past each other at some advanced level.

If you post, then go back to edit or add more data, if you don’t make enough changes it (apparently) thinks you are spam. However, if you make enough changes to the original post - it goes ahead and let’s you. I don’t know what that threshold is... but hopefully that helps.