The iRp player is programmed to play only the chords in its extensive chord menu plus (if desired) added designated bass notes by using "slash" chords. The chord-menu is opened by selecting the icon next to the chord entry field.

Chords not recognized by the iRp player can be entered and will be printed on the chart for use by (reading) musicians.
The iRp player will, in that case only sound the specified root note for the unrecognized chord.

Many users choose to select the "best" recognized chord from the menu (for the iRp player) and then enter their "preferred" chord as an alternate chord (for the reader). Some will instead enter just the unrecognized extension/quality using text below the player-chord.
)BOB