reaper problem

More detail required.

What are your signal paths? Please describe it from the all audio sources through all signal paths out to all points from which you can hear output. Also identify where in any signal path the ReaNINJAM plugin sits and what signal(s) you're referring to when you say you're recording.

Thanks.

simply when i record an ananlogig instrument on reapper. after the recording , i always replace the wave to synchronize with metronome ..but i don't have the impression to be out when i record ..a total mystery ...

Sorry, if you can't explain the signal paths, it's not going to be possible to discuss the problem.

The only hint I can give is this. If you can hear the instrument directly, rather than only through ReaNINJAM, you are immediately introducing problems.

Howard re - explain in your native tong and use google translate or post and I'll convert it for you.
I don't quite understand what you mean so could give wrong info to you.
If your saying its recording out of place compared to the metronome, which is, audio , midi or both?

I have exactly the same issue when I record midi. It sounds like I play exactly with the metronome, but when I listen back it is a fraction off, so I just line up a down beat of the clip with a down beat in reaper and it works out. I don't have this problem when recording through the mic, though.

I feel that my audio recordings are shifted by a few milliseconds with the metronome

Hello Howard. Your board has the audio system with low latency Asio 2? Why not, for my test here, you will have this latency in relation to the metronome.
A hug. Roberto

WDM driver if its on that could cause latency, as could the midi driver cause midi to record off position, sometimes changing priority on each can help.
But its best to use ASIO when possible.
There is a ASIO WDM driver that may show sometimes, this can pull multiple sound devices at once causing one to have latency and one not.

If the Mic Raz in stereo, is it different for Mono and Stereo tracks?