(I assume you want to use the Player with your practicing otherwise you would just transpose the chart to any key you desire.)
The key chosen for the song chart with the transpose button is concert key and determines the key the player uses. Choose the instrument you are playing at the time in Settings (for global transpose.)
Then transpose the song's (concert) key down a perfect 4th for soprano/tenor (Bb.) For (Eb) alto sax, up a perfect 4th.
Here is an example:
Concert key - F (the key the player is in, chosen in song view with the transpose button)
Bb - the chords will show based in G
Eb - the chords will show based in D
So with the 'other' instrument
Bb - transpose the chart to C concert - chords will show based in D
Eb - transpose the chart to Bb concert - chords will show based in G
Make sure you remember to set global transpose in Settings for the appropriate instrument you are playing.
You could create a playlist with the songs you are changing keys with so you do not lose the normal key you usually play them in with others (unless you usually play them in the default keys the songs are set in.) The last key a song is transposed to is stored in its playlist (or songs index) so creating a practice playlist just for this purpose might eliminate any confusion.
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