In RealBand there are a number of predefined shortcut keys, but I'm not aware that there are user-defined shortcuts available.

There are after-market programs that can enter a sequence of keys for you to use as shortcuts

This one may be useful


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.