Nancy hit it earlier. What machine are you using? The MXT Classic uses the Trigger to change settings within a particular mode. As for the MXT Pro, the trigger stays in the centre unless pinpointing, and the settings are changed via the Tones selection. Also, there is no Hyper-SAT setting in Relic mode. The dual purpose dial sets the Discrimination level in Relic and C&J modes. When you switch to Prospecting mode, then and only then does the dial adjust your HyperSat. Or did you mean your gain control? I suggest starting with your gain lower, somewhere between the preset and 0, and only raise it up if your machine runs fairly stable. That control adjusts your signal gain, and if it's set too high for the ground conditions, it can make the MXT extremely chatty.
Classic MXT settings (Pro in parentheses)
Relic Mode - trigger center. (Tone 2 on the Pro) Metals rejected by the DISC control setting produce a low pitch tone; metal items accepted by the DISC control setting produce a higher pitch tone. You will hear all metals, nothing is discriminated by the audio, only the tone changes pitch. Can be very noisy in a littered site.
Relic Mode - trigger forward. (Tone 1 on the Pro) Based on the Discrimination control setting, rejected targets audio is suppressed. Iron, if accepted by the discrimination control setting, produces a low pitch tone. Accepted targets produce a high pitch tone. As the Discrimination control is advanced (clockwise), the audio of targets below the current Discriminaion level is suppressed, broken, and/or modified in consistency. I believe this is the setting you wanted to be in. Adjust your Disc to eliminate the most common iron trash you don't want to hear. Any larger iron targets that make it through your disc setting, should sound with a low tone, or broken up, as long as the MXT can determine that it is ferrous in nature.
WARNING. Relic Mode - trigger forward - DISC set to full CCW (Iron ID on the Pro). This is MXT's Iron ID mode. Disables the Discrimination control so that