G100 you could set the tempo to ritard from one speed to another when you press the rit button. That seems so easy to replicate, I have no idea why other manufacturers do not do that.

Korg PA800 songbook feature. same comment, seems a no brainer that users would love that feature.

Graham
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150