I have connected guitar 13 pin output to the mixer. Each string to separate chanel on the mixer, so I can perform PAN on each string. Also, +-7V power supply was nedded.

The problem is, that these outputs are somehow quieter than normal output, I did not find any volume control. Synth volume changes from 0-5V on pin 8, it does not affect string channels.

So, if anyone already done that, please help.
Best regards.