Roland BK-9 Owner's Manual page 170

Specifications
SUPPLIED ACCESSORIES
OPTIONS
USB
Pedals
Microphone
Headphone
Vocal Performer
Amplifier
Stand
NOTE
In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.
170
Owner's Manual
PSB-1U AC adaptor,
Power cord (for connecting the AC adaptor)
Music rest
USB flash memory (M-UF-series)
Wireless USB Adaptor (WNA1100-RL)
DP-series/BOSS FS-5U pedal switch
Expression EV-5, EV-7
FC-7 footswitch
Roland DR Series
Roland RH Series
VE-5, VE-20
CM-110, CM-220
KS-12