Hi Burkels,
The CD has the software that allows communication between the EXR and computer. It allows you to use the USB port connection and transfer data (styles, etc) back and forth. The EXR3 doesn't have a floppy, so it's necessary to have the CD for that one anyway.
zuki
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Yamaha 920 / Yamaha Stagepas 100 BTRs / Senn e935 - LIVE
Roland RD 2000 / Tascam DP24sd / ATEM switcher - STUDIO