I took a look a this preset. The basic preset values are just set up to be very loud. The Output Volume is set at 4 dB and the Sustain is full blast Post Distortion at 100. Post Sustain tends to add volume b/c it's a compressor that is adjusting threshold, ratio, output gain, and attack/release all on one knob in an attempt to provide a long lasting sustain at a nominal volume level. Best bet to preserve the sound of the preset is just turn down the Output Gain to something like -6 dB or whatever works for you. You could also turn do the amount of Post Sustain. In general, a little bit of clip light on the attacks of notes should be OK.
Also, that Post Sustain was designed at the extreme ends to do that spanky compressor attack you would get from an Orange Crush or MXR compressor pedal.