What you have there is a virtual analog synth. It doesn't do auto accompaniment. However it does have built in arpeggiators and drumkits.
You will have to lay down your drum beats on an external sequencer in multi play mode and record your drum tracks on channel 10 which is the reserved MIDI channel for percussion.
The keyboard doesn't seem to have a built in sequencer.
Refer to your manual for more info on multiplay mode
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