B&K TS108 tuner. Secret functions Not in Manual!!

     The manual does not list these functions, but accidental combos of pushed buttons activate them.  The most common four to materialize are a Signal Strength meter, what seems be a Multipath meter (Not AM signal meter), a brutally slow .25 step channel change instead of the sloth slow .5 step for tuning, and an AM band, which I did not know it had for ten years or more.  No descriptions show up with these hidden functions, just the actions.  Not even the AM band is mentioned in the manual! 
     Buttons are 8 presets, Mute (Off acting, lights out), Wide, Mono, DX, up and down tune, Set, and 8 presets.     This tuner sounds as good as my nine band FM only Kenwood KT-917, with a bit more, a wee bit more, punchy bass, but only if I use my superb Audire Diffet 3 preamp, not with the very good Diffet 2.  Even FMTUNERINFO.com rated it a bit above the Kenwood in their shootout section, despite it's nearly impossible ergonomics, and the smooth functioning, spectacularly beautiful, great sounding 917.
     It is a tremendous pain to use, except with the 8 presets, and as ugly as can be, but definitely a keeper. 
     WT#, sts.     Any help is appreciated.DanV