Tell me about the TRIM adjustment. I assume the adjustment is made looking at the Level Indicator, but to what position on the scale should I adjust?

Most mixers are designed with 0 dB as the basis, but on this unit, the Channel Level Indicator goes up to +9 dB in consideration of use in a variety of environments. Furthermore, there is headroom of +18 dB through internal processing, so the sound is not necessarily distorted even if “OVER” lights.