In the Style Picker, there is a Group column, with a number alongside the group type. The lower number indicates simpler styles.

From the help:
"This column also shows a “genre score,” which describes a style by a simple number from 1 to 100. This works as follows: quiet, classical, acoustic, jazz, or folk would have low genre scores (1 to 30); loud, aggressive, or heavy rock would have high genre scores (80-100); and light-medium pop would have mid-range genre scores. You can filter the style list by the genre score with the “Other” filter button either by choosing a pre-defined range or setting your own custom range. For example, if you're looking for a quiet “living room” type style, use the filter to only show styles with a genre score less than 40. This might show jazz, classical, folk or other quiet-acoustic styles."

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Additionally, you can also use function <F5> to mute certain instruments at specific locations, or lower their volume etc.

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