Hi,
here I recorded the noise level from the Rytm. It´s playing straight out of the Main-outputs.
The Distoration and Compressor settings are very low. It would be practically unusable with this settings, because it would be not loud enough.

https://dl.dropboxusercontent.com/u/1958965/Rytm_noise.wav

Here is a beat which has good loudness. Making use of some distortion and compression. At the end you can here the noise level ,when nothing is played.

Maybe I´m too picky, but the A4 has zero noise hearable at full volume.

https://dl.dropboxusercontent.com/u/1958965/Rytm_beat.wav