I ask that because I've bought a Korg Minilogue xd some weeks ago and I don't know if it's -10dBv or +4dBu.Nothing is specified on the user manual.Its outputs are unbalanced I guess,because the Left output may be connected in Mono if the Right Output is not used.

What do you think about that,please?I would like to know because my Audio interface RME UCX let me choose -10dBv or +4dBu for its Inputs.

 

Almost all synths I know are consumer. If you're using jacks to cable out use TS (Tip/sleeve) into balanced (TRS Tip/ring/sleeve) inputs. If it's balanced/pro voltage inputs you'll need to Preamp. Synths are always consumer voltage.

 

Being less sensitive to noise is only one little advantage of using a differential/symmetrical system for transmitting low-voltage audio signals with higher impedances.
The main advantage in practice is to avoid ground loops!
Keeping everything symmetrical can avoid a lot of headaches even in small project studios.
What's a ground loop?
It's a closed ring of cabling like your metal synth case connected to AC ground, the mixing desk with a metal case also connected to AC ground on another power distributor and both additionally linked via the ground of audio cables. Any electromagnetic influence like from the power lines in your walls will be picked up by the loop acting as a coil, cause a voltage difference between source and destination and add up on the audio signal. If done correctly, a symmetrical line does no use ground as a voltage reference and will therefore be much more robust against electro-magnetic fields.
Lifting the ground connection from a balanced cable should make no difference while lifting ground from an unbalanced cable ... well, just try it (but make sure you turn down the volume before!)

One of the cheapest ways to "symmetrize" audio from a synth is the Behringer HD400.
Using low-cost transformers, it will slightly influence your sound however which may be desired or not.

 

Last edited: Jul 29, 2019

I had connected the Minilogue XD to the RME with balanced cables and set -10dBv and all works fine.
But for another synth I have,Elektron Analog4 MKII , I heard bad clicks because I connected its main outputs with unbalanced cables and these cables where very close to my gear's transformers and 240v outletsr.Since I have moved these cables far from these transformers everything is fine.
Thanks guys for your clarifications,and sorry The Pirate to be off topic.