It's still there. This is from the manual:

Play Along Wizard
The Play Along Wizard is controlled with the bottom two rows of your computer’s QWERTY keyboard or your
connected MIDI keyboard. The bottom row of keys plays chord tones; the second row plays passing tones. You play
any key in either row and never make a mistake! The Wizard keys are active during playback.

To use this feature, press the [MIDI] toolbar button and enter a check for MIDI Keyboard Wizard Enabled.

You can also select the Wizard Playalong feature option from the Play menu. In the Play menu, toggle Wizard uses “Smart”
notes to “off” (unchecked) to have the Wizard provide you access to the chromatic scale. Toggle it “on” to have access
only to the notes based on the chord/key of the song. Also, the Wizard works with the harmony feature, so you can play
along live in 4-part saxophone harmony for example.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.